A Jamboree Scout leader has been granted conditional bail after he was charged with aggravated indecent assault at Cataract National Park, south-west of Sydney.

Mark Gaynor appeared at Parramatta Local Court via audio visual link on Saturday.

A Western Australian Jamboree Scout leader has been charged with aggravated indecent assault.

A Scouts Australia spokeswoman confirmed Mr Gaynor was a registered leader and his membership and registration in scouts was immediately terminated after the arrest.

The Western Australian man on January 4 allegedly aggressively groped the victim's buttocks with both hands, court documents stated.