The Member for Kiama, Gareth Ward, has stood down from his role as the Minister for Families, Communities and Disability Services to move to the cross bench, after it was revealed he is the subject of a police investigation into sexual violence-related allegations dating back to 2013.

Mr Ward has denied any wrongdoing.

"Today I have been made aware by a journalist of an investigation into me by NSW Police," he said in a statement.

"I have not been contacted by police in relation to any allegations.

"Until this matter is resolved, it is appropriate I stand aside from my role as Minister. I will also remove myself from the Liberal Party room.

"I will not be making any further comment at this time."

The Premier Gladys Berejiklian also issued the following brief statement.

"I was made aware through media reports today that an MP is under investigation by police.

"I have subsequently received advice from Minister Gareth Ward of his decision to step aside as Minister and sit on the cross bench while there is speculation about his future.

"I support his decision.

"The Attorney General will act in Mr Ward’s portfolio responsibilities."

As investigations are continuing, the Police have said no further information will be made available.