After graduating from high school, he joined Furukawa Electric (later JEF United Ichihara) in 1989.
His only match in the J1 League at Yokohama F. Marinos is last game in 2003 season.
In this match, he played instead Tetsuya Enomoto was shown a red card in the 15th minute.
On June 10, 1995, Shimokawa debuted for Japan national team against Sweden.
This biographical article related to a Japanese association football goalkeeper is a stub.