In his rookie season, Roy was named an assistant captain for the team and competed with Team Canada Quebec at the 2014 U17 World Hockey Challenge. He finished his rookie campaign recording 16 goals and 25 assists in 63 regular season games. Prior to the 2014–15 QMJHL season, Roy competed for Team Canada in the Hlinka Gretzky Cup, where he won a gold medal. His sophomore campaign proved to be more successful than his first as he was selected for the CHL Top Prospects Game and set new career highs in goals, assists, and points. On April 15, 2015, Roy was named to the Team Canada's final roster prior to the 2015 IIHF World U18 Championship.