The masseur, referred to as John Doe in court papers obtained by Reuters and filed last Friday, claims that Travolta rubbed his leg, touched his genitals and tried to initiate at least one sex act inside a private bungalow at the exclusive hotel on January 16.
Travolta's spokesman dismissed the claim in a statement as a "baseless lie."
"On the date when plaintiff claims John met him, John was not in California and it can be proved that he was on the East Coast," the statement said. "John intends to get this case thrown out and then he will sue the attorney and plaintiff for malicious prosecution."
The masseur's lawyer, Pasadena, California-based Okorie Okorocha, told Reuters that under California law, a victim of a sexual assault like his client can file as John Doe if he fears extreme embarrassment if his identity is known.
The suit goes into detail to describe the incident, saying the massage was arranged by an anonymous phone caller who met the masseur at a streetside location, picked him up and drove him to the hotel where he was to be paid $200 per hour.
"I wanted to make sure we had as much detail as possible. The more detail I have the more accurate I think" the claims are, Okorocha said.
Okorocha added that it took time between the incident allegedly occurring and the case being filed because he wanted to investigate his client's claims and discuss it with Travolta's representatives.
"We did discuss the matter with some of his people to see if there was any way it could be resolved ... to make it easier on everyone," Okorocha said.
The civil suit claims assault, sexual battery and intentional infliction of emotional distress, and the plaintiff is seeking a jury trial, according to the filing.
The statement from Travolta's spokesman called the lawsuit "a complete fiction and fabrication. None of the events claimed in the suit ever occurred."
Travolta, 58, rose to fame in the 1970s on television sitcom "Welcome Back Kotter," then became a movie star with hits such as "Saturday Night Fever," "Grease" and later, "Pulp Fiction." He has been nominated for two Academy Awards and has been married to wife Kelly Preston since 1991.