Sukhmandeep Singh, 27, an Indian national in Australia on a student visa, was travelling on a bus between Campbelltown and UOW on the morning of April 2 when he put his finger through the side of the bus seat and began touching the buttocks of the woman in front of him as they neared Appin.

The victim told police she felt someone poking her right hip and upper buttock area and looked down to see a set of fingers retracting from a gap between the seat and wall of the bus.

The woman moved to the other side of the bus, at which time she saw Singh sitting behind her.

Moments later, Singh moved into the woman's now-vacant seat and put his hand down again.

The victim feared Singh was going to repeat his actions on another young woman sitting in front of him, prompting her to call out to Singh and tell him to stop.

The victim reported the incident to the university's security team that afternoon.

The information was passed onto police two days later and the woman provided a statement outlining what had occurred.

Police phoned Singh on April 8 and arranged for him to come to Wollongong Police Station for an interview however he didn't turn up, claiming he was sick.

The following day, Singh approached the victim at the bus stop and said asked her to withdraw the complaint and it would "ruin" his future.

Singh was arrested on April 12 and charged with a single count of sexually touching another person without consent.

He pleaded guilty to the charge in Wollongong Local Court on Tuesday, where his lawyer asked for his client to be spared a criminal conviction due to his genuine remorse.

However, Magistrate Michael Stoddart described the facts as "disturbing" and said the matter was too serious not to record a conviction.

He placed Singh on a 12-month community corrections order and fined him $2,000.