In 1976, Ragan played for the Canada U-20 men's national soccer team during its unsuccessful qualification campaign for the 1977 FIFA World Youth Championship. He went on to play 40 times for the Canadian national team. His first game was a 4–0 win over New Zealand on September 15, 1980. His last was a 1–0 loss to China on August 31, 1986. His greatest achievement came when he played all three games for Canada during the 1986 FIFA World Cup. Ragan also played nine games with the Canadian Olympic team and was a member of the 1984 Olympic Canadian soccer team which went to the quarterfinals of the 1984 Olympic soccer tournament.