The Phoenix Tent will also host New York indie pop outfit The Pains of Being Pure at Heart.
Joining them will be SLUG, a new band fronted by former Field Music bassist Ian Black and collaborative duo Aidan Moffat and Bill Wells.
The festival near Dundrennan takes place on 24 and 25 July.
The Wickerman Festival's Brian Reynolds said: '"With just five weeks to go until this year's festival, it's fantastic to announce our new stage and the raft of talent that it will showcase.
"We are confident that the mix of acts will be a big hit with Wicker fans."

The sum is on top of more than £1.2bn set aside in previous years' provisions.
Parent company National Australian Bank (NAB) said between £350m and £500m more would be set aside this year, but added that the final cost remained uncertain.
The move was announced in its third quarter results on Monday.
Up until the end of March, NAB had set aside £806m to compensate customers for the mis-selling of payment protection insurance (PPI). A total of £325m has already been paid out.
NAB's cumulative provisions relating to interest rate hedging products amounted to £431m, about half of which has been paid out.
This year's extra funding will come from a £1.7bn mis-selling fund, which the bank is being required by UK regulators to make available after the Clydesdale is floated.
NAB is in the process of demerging and floating Glasgow-based Clydesdale, which includes the Yorkshire Bank.
It intends to complete the break-up by the end of this year.
In a statement, NAB said "substantial progress" had been made on the demerger and stock market sale. It will provide more detail with full-year results in late October.
The Australian banking group has been working hard to offload the Clydesdale, which amassed a large portfolio of bad property loans.
It has also been facing high costs of redress for mis-selling payment protection insurance and complex systems for business customers to protect against interest rate changes.

One head teacher decided "all reading can be done on iPads," a delegate told the Association of Teachers and Lecturers' annual conference.
The union voted to lobby for libraries to be included in Ofsted inspections.
A Department for Education spokeswoman said that school libraries "played a vital role".
Cathy Tattersfield from Derbyshire quoted international evidence suggesting a positive correlation between good school libraries and student attainment.
Ms Tattersfield said she had been "shocked" that two secondary academies had "recently closed or attempted to close their libraries and several of them have had their librarian hours or posts cut, mostly in the ex-mining areas of Derbyshire".
A survey of 485 ATL members last month suggested a patchy picture on library provision said Ms Tattersfield.
"It seems to be feast or famine.
"Some secondary provision is fine, cherished and secured," - but others faced reduced opening hours, conversion to e-learning centres, cuts in staff hours, or librarians having been removed or replaced by support staff or teachers.
"We identified a third of secondary schools have had cuts of 40% or more since 2010, with 20% redundancies in library staff at their school."
Another delegate said his school library, closed last year, had provided a host of benefits to pupils, from paired reading for special needs pupils to introducing able readers to new authors and running a range of enrichment activities.
He said the library's books and magazines had been distributed among subject departments.
"Lesley Mumbray-Williams whose school dispensed with her services as librarian said a third of the stock had ended up in skips within three weeks of her leaving."
Another delegate said the librarian post in their school had not been filled and the library doors were often locked.
Of the education staff who responded to the survey:
A Department for Education spokeswoman said: "We want all children to read widely and well and believe school libraries can play a vital role in fostering that love of reading.
"We trust schools to decide on whether to provide and maintain a library service for their pupils."
Scottish band the BMX Bandits have been announced as one of the acts playing a new contemporary music stage at the Wickerman Festival.
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Clydesdale Bank is to set aside as much as £500m in extra funding this year to compensate customers for mis-selling of financial products.
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Too many school libraries in England face cuts or closure with schools increasingly viewing books as obsolete, a teachers' union has heard.