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An off-duty NSW police officer who was deployed to Perth for the Commonwealth Heads of Government Meeting last year faces a jail term after he pleaded guilty to sexually assaulting a young woman on the dance floor of a Perth club.

Ian Robert Sleigh, a 45-year-old senior constable, pleaded guilty to indecently assaulting a 22-year-old woman after prosecutors accepted his offer to admit to that charge.

He had originally been charged with the more serious charge of sexual penetration without consent.

The District Court was told today that on October 29 last year Sleigh had drunk eight full strength beers and vodkas when he assaulted the woman, who he had met through a mutual friend that night, on the dance floor of the Elephant and Wheelbarrow.

State prosecutor Therese Austin said Sleigh initially denied any wrongdoing and claimed the woman had been grinding up against his leg.

She said CCTV footage supported the victim's version of events and showed Sleigh slipping his hand underneath the woman's dress.

Ms Austin said this was a "very serious example" of an indecent assault. She told the court Sleigh's defence would likely be arguing for a suspended sentence.

Judge Bruce Goetze renewed Sleigh's bail, but imposed a 10pm curfew for the policeman who is staying at a city hotel with his father until Thursday when he will be sentenced.

Sleigh's lawyer did not make any sentencing submissions today.