Ventnor Beach on Phillip Island is the only official offleash beach all year round without time restrictions.
There are 2 entrances to this beach, I'm not sure if there are toilet facilities at Tyro Street Entrance. We parked at the end of Ventnor Beach Road.
It features a decent carpark and toilet facilities.
p.s.: On the way back, we stopped at the Chocolate Factory to end the day on a sweet note, but sadly the outdoor dinning patio was closed (don't know when and if it's permanently closed? The last time we visited this place was 8 years ago).