Hasan Karkardi has been suspended for six months for sparring with Blackwell, who was left requiring surgery to reduce swelling on his brain.
The British Boxing Board of Control said Wilkins' conduct was "detrimental to the interests of boxing".
Blackwell, 26, retired after suffering a bleed on the skull in March.
He spent a week in an induced coma after losing his British middleweight title fight with Chris Eubank Jr.
Despite Blackwell not having a licence to fight, and despite him being advised not to return to the ring, he sparred with Karkardi, 29, on 22 November at a boxing club in Devizes, Wiltshire.
On Wednesday, a family member told BBC Sport Blackwell is still unable to walk, and a year away from making a full recovery.

In Catholicism, abortion is viewed as such a grave sin that it warrants automatic excommunication.
In most countries, only a bishop can approve forgiveness for abortion. They would then delegate an expert priest to hear the confession.
The change is only for the coming Jubilee Year, beginning in December.
However, the rule relaxation will not affect Catholics in England, Wales and Scotland as all priests there can already forgive abortion without seeking permission from a bishop.
The Pope said many women who sought an abortion did so because they "believe that they have no other option".
He added that he had "met so many women who bear in their heart the scar of this agonising and painful decision".
The easing of the rules is being seen as a shift in Catholic Church policy, reflecting the Pope's outspoken views on compassion and mercy.
"'I have decided, notwithstanding anything to the contrary, to allow all priests for the Jubilee Year to absolve of the sin of abortion those who procure it and who also seek forgiveness," Pope Francis said.
Pope Francis is aware that the decision will not be welcomed by traditionalists, says the BBC's David Willey.
However, in contrast to his predecessors, he regards compassion and mercy as virtues that outclass all others.
The Jubilee Year runs from 8 December 2015 to 26 November 2016 and is seen as one of the Catholic Church's most important events.
It normally takes place every 25 years unless a pope declares an extraordinary one to draw attention to a particular issue.
The Pope has previously denounced abortion as part of a throw-away culture.
"It is horrific even to think that there are children, victims of abortion, who will never see the light of day," he said in 2014.
"Unfortunately, what is thrown away is not only food and dispensable objects, but often human beings themselves, who are discarded as unnecessary," he added.
Pope Francis has been viewed as progressive on other controversial issues. In 2013, on the topic of homosexuality, he said: "Who am I to judge?"
However, he has not changed Church policy on contraception.
Speaking earlier this year, Pope Francis said that although contraception remains forbidden, there was no need for people to breed "like rabbits" to be good Catholics.

Laser mapping will be used to measure the impact of extreme weather on six Welsh islands in the Irish sea.
The aircraft beams will assess the effect of rising sea levels and storms on locations, including Bardsey and Ramsey islands.
The mapping will also create "stunning" animations as part of the first 3D data for many of the islands.
Led by the Royal Commission of the Ancient and Historical Monuments of Wales, the five-year project will assess the damage done to archaeology and heritage sites by coastal erosion.
"This is an exciting new project, bringing a strong partnership of archaeologists, geoscientists and maritime specialists to bear on the significant challenges posed by climate change," said commission secretary Christopher Catling.
Trainer Liam Wilkins has had his licence withdrawn after overseeing the sparring session that left retired boxer Nick Blackwell in hospital.
[NEXT_CONCEPT]
Pope Francis is making it easier for women and doctors to seek forgiveness for abortion, by allowing all priests to forgive it.
[NEXT_CONCEPT]
Animation showing the threat of climate change is on the horizon, thanks to new 3D laser mapping.