Nakamoto was born in Hiroshima Prefecture on October 29, 1959. After graduating from Chuo University, he joined Japan Soccer League club Nippon Kokan (later "NKK") in 1982. From 1985, the club won the 2nd place for 3 years in a row. In 1987, the club won JSL Cup. He played for 168 matches for the club. He retired in 1991.