French made 47 appearances for the Eels since his debut in May 2016, scoring 35 tries.
“I feel honoured and very excited to have been afforded the opportunity to play for such a great club as Wigan,” French said on the Wigan website.
“I am very much looking forward to the challenge and moving forward I am confident that I can contribute to the future success of Wigan in Super League in the next couple of seasons.”
“Bevan is an exciting player and, once we were made aware of his availability, we moved quickly to secure his services,” said Wigan Executive Director, Kris Radlinski.
“The opportunity has only arisen due to Taulima Tautai’s departure since we would not have had salary cap space to accommodate another player otherwise. Bevan can play every position in the backline through to the half-backs and we’re delighted to announce that he’ll be joining us for the remainder of the season and for another two year after 2019.”