Brown is seeking unspecified damages and is claiming fraud and slander. His suit alleges he helped broker the deal between Simmons and the IRL, but was cut out of the contract while on a personal vacation.
He also claims Simmons and his business partners mischaracterized him as "lazy" and "rich" to racing league officials.
Simmons promoted IndyCar racing in 2006, and even co-wrote a song, "I Am INDY."
An e-mail message left for Simmons' attorney was not immediately returned Wednesday.