The 25-year-old won the last of his six caps for Les Bleus against England 17 months ago in the 2013 RBS 6 Nations, falling out of favour following an unhappy spell with Racing Metro.
Fall struggled to live up to his record €506,000 price tag after moving from Bayonne in 2010, but is looking forward to a fresh chapter in his career.
"I'm counting on this year to re-launch myself," said Fall. "The World Cup is in a corner of my mind but I try not to think about it too much.
"If at first with Montpellier I can get playing time and consistently perform then I think if I succeed, my return to the France team will happen naturally.
"I'm starting from scratch and it is up to me to prove afresh that I can play at that level."
Fall believes the mentality at Racing Metro led him to falling out of love with rugby union, but an alternative style of play at Montpellier could bring out the best in the Bordeaux-born star.
"The style of play at Racing is quite destructive," he said. "When things aren't going well, you doubt everything and redouble your efforts. You over-train, the tiredness comes and your body reaches breaking point.
"I've come here to rediscover the joy of playing, and the choice of Montpellier was a natural one.
"The expansive game produced here over the last four years has been huge, it's nice to see and fun to play. The philosophy of the coaches is to give free rein to the players."
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