Sebastiaan won the Benelux and Dutch Formula Ford 1800 championships in 1996, but decided early in his career formula racing was not his thing and already started driving sports cars and touring cars from 1997.

He became the Dutch Renault Clio Cup champion three times, winning the championship in 2002, 2004 and 2011.

Since the merger of the American Le Mans Series and the Rolex Sports Car Series, which became the IMSA Tudor United SportsCar Championship, he drives a SRT Viper GT3-R with Riley Motorsports in the GTD class together with his brother and Ben Keating.

(key) (Races in bold indicate pole position) (Results are overall/class) ‡ Not eligible for points.

At the 2013 Petit Le Mans Bleekemolen was the fourth driver and was not able to score points.