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.
In January 1995, Okano was selected by the Japan national team for the 1995 King Fahd Cup, but he did not play in the match. On September 20, he debuted for the Japan national team against Paraguay. In 1996, he played at the 1996 Asian Cup. During 1998 World Cup qualification, in the final qualifier match for the 1998 World Cup against Iran, he scored the golden goal that took Japan to their first ever World Cup finals. At the 1998 World Cup, he played 29 minutes as a substitute against Croatia. He also played at the 1999 Copa América. This competition was his last game for Japan. He played 25 games and scored 2 goals for Japan until 1999.
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