After joining the youth academy of Montpellier HSC, Beusnard was not retained due to his late physical development.

[3] In December 2019, due to injuries and personal issues, he mutually agreed to terminate his contract with Gazélec Ajaccio and subsequently joined Pau FC.

[4] With Pau FC, he helped the team finish at the top of the 2019–20 Championnat National, earning promotion to Ligue 2.

[citation needed] During the 2020–21 Ligue 2 season, which marked the club's first-ever professional campaign, Beusnard initially struggled, as did his teammates.

[8] During the 2022–23 Ligue 2 season, Beusnard established himself as a key player in Didier Tholot's midfield, alongside Henri Saivet and Sessi d'Almeida.