NSW Police are looking for help from the public after a man allegedly committed a sexual act at Kiama train station in April last year.

The incident occurred at 11:40AM 24 April, when a man attempted to board a train from Kiama to Bomaderry.

 Passengers told staff that the man was allegedly sexually touching himself, and he was subsequently removed from the train and escorted away from the station.

The incident was reported to police, who commenced an investigation. Police have since released an image of a man they hope can assist in their investigation.

He is described as in his late 20s to early 30s with a medium build, dark hair, and was wearing a black hooded Everlast jumper and long black pants at the time.

Anyone that recognises this person or has any other information relating to the incident should contact Crime Stoppers on 1800 333 000.