Waterfall bay (near eaglehawk neck) waterfalls fall into the ocean.
St columbus falls (near st helens)
Liffey falls (near deloraine)
Russell falls (Mt Field, about 1 hour from Hobart)
Snug Falls (South of Hobart - about 30 mins)
For a start. Having said that January is summer, so chances are some if not all of these falls may not have any water coming over them.