Hendry Thomas will be the third Honduras international to play for Wigan, with left back Maynor Figueroa and Wilson Palacios becoming key members of the team.
"He is another quality addition," said new Wigan manager Roberto Martinez.
"Everyone knows how well Wilson and Maynor have done in the Premier League and it is no wonder there was lots of interest in Hendry, who comes from the same club as those two and has impressed," the former Swansea boss told Wigan's website.
"He is a powerful figure in midfield, who can sit in front of the back four and destroy attacks, or can also come forward and score.
"He is a player the club has worked really hard to secure these past months, with representatives from here travelling over to Honduras to meet with him and broker the deal - and all that hard work has paid off now."
Thomas, who nearly joined Wigan last season but the deal fell through, said: “I have worked hard all season to stay fit and qualify for the work permit rules and it is a dream come true for me to come to England.”
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