Between Melbourne and Sydney, theMount Hotham Alpine Resort has a nice trail system, plus access to plenty of backcountry around Mt. Loch and Razorback.
From the Hotham summit near the fire tower, there are great backcountry bowls worth exploring. Stay to the southwest to reach the road below near the Diamentina Shelter. For the adventurous, try the Razorback and the route up Mt. Feathertop.
To reach the snowboarding at Hotham from Melbourne, follow the Hume Freeway towards Sydney. At the McDonalds restaurant, turn right. In Hotham near the ski bridge, there are many commercial lodges. Marouka Lodge is about 1 km further just past Big D on the right. When snowboarding and freeriding internationally, it is important to get a travel insurance policy that covers emergency rescue, medical expense and evacuation. There are many destinations that will not initiate rescue or medical treatment without prior payment or proof of insurance. In many cases, the rescue fees, medical fees or evacuation to a reputable hospital can total tens of thousands of dollars. Plans such as GEOS SAR100 or IMG Patriot Travel Medical Insurance are well worth the per-trip cost of $130 to $200 USD.
Overall, Mount Hotham Alpine Resort is the 3rd most popular snowboard & freeride destination of all 3 snowboarding resorts in Australia.