The 23-year old Norwegian defender has departed Parkhead after three-and-a-half years with the Hoops and is now looking forward to the next phase of his career with the Latics in England's Championship.
"It's feels great to have joined the club, the process was quite short which was good and I'm looking forward to getting started now," he told Wigan's official website.
"It's an exciting chapter for me; English football is something special and being Norwegian we follow the game over here very closely, so to be a part of it makes me very happy.
"I've seen Wigan Athletic play quite a lot when the club was in the Premier League, and obviously the whole of Europe has been speaking about the club after the FA Cup win in May.
"I think many people have been charmed by the way the club is run and how the team plays, so it's great to be here."