Romy was named to Switzerland's under-18 team for the 2002 IIHF World U18 Championships in Slovakia. He managed to score 14 points, including 9 goals in 8 games, helping Switzerland to avoid relegation. He was again named to the team for the 2003 IIHF World U18 Championships in Russia. He put up 12 points in 6 games as Switzerland was relegated.