Abendanon has won the European Player of the Year award, the third time a French-based English player has won it.
Yet since the 2011 Rugby World Cup, an RFU rule has said only those involved in domestic rugby can play for England.
"Having that rule in place restricts players from playing at the top level," said 28-year-old Abendanon.
"You're playing with the best players in the world and coming here has made me a better player and better person.
"I know exactly why the RFU has that policy in place and I don't expect it to change - but I have changed my mind on it since moving out here."
Abendanon played two matches for England in 2007 but last summer he moved from Bath to Clermont, scoring a fine solo try in the 24-18 loss to Toulon. in the final of the European Rugby Champions Cup.
Toulon's Steffon Armitage and Jonny Wilkinson, now retired, won the European Player of the Year award, in 2014 and 2013 respectively.
After winning the award, Abendanon told BBC Radio 5 live he "would encourage more people to move" to France.
Abendanon has said "it would be a dream come true" to represent England in the 2015 World Cup, but England head coach Stuart Lancaster has only picked domestic-based players.
"I played for 10 years in England and came out to France because I thought my international career was over," added Abendanon. "I'm sure Steffon felt the same.
"Playing in France has rejuvenated our games and whether we get rewarded for that is up to Stuart."
Listen to Abendanon speak to BBC Radio 5 live

The 25-year-old from Plymouth, who also dived at the 2006 Commonwealth Games and 2009 World Championship, has quit after a
"I just feel like my body is telling me to give up," the 10m platform diver told BBC South West Sport.
"I'm 25-years-old and knowing there's another four years until Rio, I just don't think my body will hold out."
My dream, even as a little girl, was to make an Olympic Games. Not making London was heartbreaking and my dreams were shattered
Graddon, who won a bronze medal at the 2009 European Diving Championship in Turin, cites 2008 as the best year of her career as a diver.
She said: "I'd come back from injury and illness and that year I was British champion and qualified for the Olympic place for Great Britain, although I didn't make Beijing."
Graddon, who trained alongside Tom Daley and Tonia Couch in Plymouth, says her biggest regret is never being selected for an Olympics, after also missing out on a place at London 2012.
"My dream, even as a little girl, was to make an Olympic Games," she added.
"Not making Beijing was sad and I was gutted not to make it, but I thought 'head down, London's in four years'.
"But not making London was heartbreaking and my dreams were shattered.
"I knew I probably wouldn't make Rio, so it was horrible and the worst feeling not getting what I wanted, but that's sport."
Clermont full-back Nick Abendanon says the Rugby Football Union should allow players working for clubs outside England to represent the national team.
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European bronze-medal winning diver Brooke Graddon has announced her retirement from the sport.