The Montpellier-bound flanker is not travelling with Andy Robinson's squad for the summer tour in Australia, having missed out on last year's Rugby World Cup.
"I'm looking forward to testing myself in a different environment," said the former Glasgow Warrior.
"I'm only 26 and still have a lot that I want to achieve at club and international level."
Beattie was very much a fringe player as Glasgow Warriors reached the Rabo-Direct Pro12 play-off semi-finals this season.
He added: "I've had eight amazing years at Glasgow, but I thought the time was right for a fresh challenge.
"Montpellier are in the quarter-finals of the Top 14 – I feel they will be the perfect springboard to get back into the Scotland set-up."




