And he has opted to join the reigning European Champions, becoming their third signing for next season following the signatures of Perpignan hooker Guilhem Guirado and Montpellier back rower Mamuka Gorgodze .
"Wales second row Ian Evans will carry the colours of RCT during the next three years. He will join the club this summer," read a statement on the Toulon website.
Evans has been part of the Liberty Stadium set-up since 2005 and has made 23 Heineken Cup appearances for the Ospreys. He has not featured in Europe so far this season due to an Achilles injury but will line up for Wales against Australia at the Millennium Stadium on Saturday.
He will then turn his attentions to continental competition when the Ospreys return to Heineken Cup action in the first of their back-to-back matches with French Champions Castres Olympique a week on Friday.
The Welsh region lost their opening two encounters and must win both matches in the December double headers to keep any realistic hopes of qualification for the knockout stages alive as Evans looks to leave on a high.
His agent Derwyn Jones also Tweeted to confirm the move: "Congratulations to @__Yanto who has officially signed a 3 year contract with @RCTofficiel starting July 2014," wrote the former Cardiff and Wales lock.
The capture of Evans is the latest piece of good news for Toulon boss Bernard Laporte, who will welcome back South African stars Bakkies Botha and Bryan Habana and French duo Frédéric Michalak and Mathieu Bastareaud for this weekend's Top 14 trip to Stade Francais.
Former Bath scrum-half Michael Claassens is set to make his return to action after more than a month on the sidelines having injured his hand during the opening Heineken Cup clash with Exeter Chiefs at the Stade Felix Mayol on October 13.