Growing up in Alberta, Soucy competed at the Triple-A midget level until he was 18 before being cut from the Edmonton Oil Kings of the Western Hockey League (WHL).

[2] Upon returning from the softball tournament, Soucy suffered a torn medial collateral ligament (MCL) and missed numerous games to recover.

[6] On April 11, 2017, at the conclusion of his four-year collegiate career, Soucy was signed to a two-year, entry-level contract with the Minnesota Wild.

[9] After playing 67 games in the AHL, accumulating 15 points and a team-leading plus-12 rating,[10] Soucy was recalled to the NHL on April 2, 2018, following an injury to Ryan Suter.

[11] He made his NHL debut against the Edmonton Oilers that night, registering three shots and two hits in 15:26 of time on ice.

[17] After two seasons with the Seattle Kraken, Soucy left the club as a free agent and was signed to a three-year, $9.75 million contract with the Vancouver Canucks on July 1, 2023.