The 24-year-old forward had 60 points (28 goals, 32 assists) in 81 games for the Jets last season. Dubois became a restricted free agent July 13.
He will play his first season under new coach Rick Bowness, who was hired July 13.
"I didn't ask for a trade," Dubois said Monday. "There was no doubt in my mind I was going to show up for camp. I'm excited to meet the new coaching staff and players."
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Selected by the Columbus Blue Jackets in the first round (No. 3) of the 2016 NHL Draft, Dubois has 239 points (102 goals, 137 assists) in 361 regular-season games for the Jets and Blue Jackets and 22 points (eight goals, 14 assists) in 33 Stanley Cup Playoff games.
Dubois was traded to Winnipeg by Columbus for forwards Patrik Laine and Jack Roslovic on Jan. 23, 2021.