Minoguchi was born in Chiba Prefecture on August 23, 1965. After graduating from Kokushikan University, he joined Japan Soccer League club Furukawa Electric (later "JEF United Ichihara") in 1988. He played 67 games and scored 14 goals in Japan Soccer League. From 1993, he played for Japan Football League club PJM Futures (1993-1994), Fukuoka Blux (1995) and Oita Trinity (1996).