A WA police sergeant will fight allegations he sexually abused four boys while he was a school teacher at a Catholic college more than 30 years ago.

Eamon Dominic Heary, 56, faced Perth Magistrates Court on Monday, accused of indecently dealing with the eight-year-old boys sometime between 1984 and 1985.

Heary, who has been stood down from operational duties, pleaded not guilty to all charges and had his bail extended before a committal mention on July 22.

- AAP