Byram was selected by Canada for the 2020 World Junior Ice Hockey Championships. He recorded two assists in seven games en route to a gold medal. Byram co-captained the team alongside Dylan Cozens the following tournament to replace the injured Kirby Dach; he scored five points in seven games in a silver medal finish for Canada. In capturing the silver medal and being selected to the Tournament All-Star Team, Byram became the first Vancouver Giant player to hold multiple World Junior Championship medals.