Desmet was born in Duffel, lives in Mechelen, and is the younger brother of short track speed skater and Olympic bronze medalist Hanne Desmet.
Desmet started short track speed skating at a club in Wilrijk at the age of 10. In 2012, he was scouted by the Belgian short track national team coach Pieter Gysel to participate in the Sport Vlaanderen supported project "Be Gold" to train talented youth professionally in Hasselt, with the Winter Olympics as the main goal.[1]
Desmet is the Belgian record holder in the 500 meters. At the 2016 Winter Youth Olympics in Lillehammer, Norway, he won a gold medal in the mixed relay event in an international team, alongside Desmet consisting of Quentin Fercoq (France), Ane Farstad (Norway) and Kim Ji-yoo (South Korea).