Coomans began playing for Penarol Engsbergen in
Tessenderlo. At the age of seven, he tried out for
Genk but chose to join
Sint-Truiden. His initial contract with Genk was signed in January 2019. In November 2021, he participated in a friendly game against
Oud-Heverlee Leuven, sharing the pitch with players like
Mike Trésor,
Joseph Paintsil, and
Théo Bongonda. His next move came in January 2022 when Genk loaned him to
Thes for the rest of the season due to
Sam Vanaken's long-term injury. Throughout his debut full season at Thes, he contributed in 32 out of 38 league matches. Prior to the conclusion of the 2022–23 season, Coomans announced his departure from Thes. In June 2023, it was announced that Coomans had joined Dutch
Eerste Divisie club
MVV, signing a two-year deal with an optional third season. He made his official debut for the club on 13 August 2023, starting in a 3–1 victory against
VVV-Venlo under the management of
Maurice Verberne. ==Career statistics==