The Chile international winger has put pen-to-paper on a two and a half year deal at the DW Stadium, with the move being rubber-stamped after the South American passed a medical on Wednesday.
Roberto Martinez is delighted to have added the attacking midfielder to his squad, and feels Beausejour could play an important part in keeping The Latics in the English top flight.
“Jean is a player we have been tracking for a long time since he made a huge impression on us with his role for Chile in the World Cup,” Martinez told the club’s official website.
“Now Jean has 18 months of experience in the British game and his dynamism, technical ability and tactical concepts will bring a different dimension into our squad.
“He is ready to bring his own experience and his energy into the fantastic challenge that as a football club we’re facing in the next 16 games of the season,” the Spanish coach stated.
Beausejour also spoke of his happiness at moving to Wigan, and is keen to get started with his new team.
“Roberto told me about the plans he has for the club and I am really excited to join and meet my team-mates.
“We have a really tough end of the season, but I am really looking forward to the challenge ahead.
“I want to thank all the supporters at Birmingham and now I have to concentrate on getting in the team and doing my best for Wigan Athletic,” he commented.
By Gareth McKnight