Scherwey was named to Switzerland's under-18 team for the 2009 IIHF World U18 Championships in the United States. He played 6 games, tallying 5 points (3 goals) to help Switzerland avoid relegation. Scherwey was named to Switzerland's under-20 team for the 2010 World Junior Ice Hockey Championships in Canada. He played 7 games, scoring 3 points (1 goal) to help Switzerland finish 4th in the tournament, falling to Canada in the semi-finals. He was again named to the team for the 2011 edition. He played 5 games, scoring no point as Switzerland finished 5th in the tournament, falling to Canada in the quarter-finals.