Soejima was born in Saga on July 26, 1959. After graduating from Saga Commercial High School, he joined Japan Soccer League club Yanmar Diesel in 1978. After reserve team in 2 season, he was promoted top team in 1980. In 1980, the club won the champions in Japan Soccer League and he was selected Best Eleven. The club also won 1983 JSL Cup and 1984 Emperor's Cup. He played 167 matches for the club until 1991. In 1991, he moved to Division 2 club Sumitomo Metal and played in 1 season. He retired in 1992.