The Los Angeles Times says the federal court lawsuit contends two men were kept off the Revenge of the Mummy: The Ride in violation of the Americans with Disabilities Act.
Angel Castelan's forearms were amputated after an electrical accident as a child and Marvin Huezo's legs were amputated after a car accident.
Castelan says ride operators told him in 2010 that he couldn't ride the coaster because he doesn't have hands to grip the safety bars.
He returned to the theme park last year with Huezo and operators told them a new policy requires riders have at least one hand and one leg.
A theme park spokesman says they don't comment on pending litigation.
Information from: Los Angeles Times