Shimoda was set to be the second driver for the SuperNova team in GP2 Series during 2005. However, at the last minute, he was replaced by Adam Carroll who will now partner ex-Jordan Grand Prix driver Giorgio Pantano.
In 2005, Shimoda won the Monterey Sports Car Championships, the final race of the season in the ALMS. He was partnered by Tom Chilton in a Zytek 04S LMP1 sports prototype.
Shimoda also represented Japan in the A1 Grand Prix series for the first time at Eastern Creek in November 2005, and was lucky to escape with only a concussion after a spectacular crash in which the engine separated from the chassis. He also occurred in another spectacular crash at the A1 Grand Prix round in Mexico. The cars were under a yellow flag when as they were coming onto the pit straight Shimoda's car was launched airborne after hitting the back of A1 Team New Zealand's car. Shimoda escaped unhurt.
Shimoda is currently racing in the World Series by Renault championship for the Victory Engineering team.