Byfield won a silver medal at the 2019 Hlinka Gretzky Cup. Byfield won a Gold Medal with Canada at the 2020 World Junior Championships held in the Czech Republic, posting 1 assist in 7 games. Byfield won a silver medal with Canada at the 2021 World Junior Championships Held in Canada, Posting 2 goals and 5 assists for 7 points in 7 games.