Okano was born in Yokohama on July 25, 1972. After dropped out from Nihon University, he joined J1 League club Urawa Reds in 1994. In 1990s, he played as forward in many matches from first season. In 2001 season, his opportunity to play decreased and he moved to Vissel Kobe in September. He played as midfielder from then. He returned to Urawa Reds in 2004. The club won the champions 2006 J1 League, 2005 and 2006 Emperor's Cup. In Asia, the club won 2007 AFC Champions League. In 2009, he moved to Hong Kong First Division League club TSW Pegasus FC. In July 2009, he returned to Japan and joined Japan Football League club Gainare Tottori. The club won the champions in 2010 and was promoted to J2 League. He retired end of 2013 season.