Yearwood played and scored at the 1977 FIFA World Youth Championship, the inaugural staging of the FIFA World Youth Championship held in Tunisia. He made his senior debut for Honduras in a June 1982 FIFA World Cup match against Spain, which was his country's first ever World Cup match, and has earned a total of at least 46 caps, scoring 1 goal. He has represented his country in 21 FIFA World Cup qualification matches and played at the 1991 and 1993 UNCAF Nations Cups as well as at the 1991 CONCACAF Gold Cup.