Willy Roy appeared in nine international events, six of which were FIFA World Cup qualifying competitions.
In 1972, Roy played four games with the national team, all 1974 World Cup qualifying matches. Friendly 1970 World Cup Qualifying Friendly 1970 World Cup Qualifying 1970 World Cup Qualifying 1974 World Cup Qualifying 1974 World Cup Qualifying 1974 World Cup Qualifying Friendly 
