Douglas River Cabins. 2 fully self contained cabins right on the Douglas River.
See their website.
Aurora Beach Cottage. An outstanding 2 storey wood and stone cottage right on the beach at Seymour. Totally private.
Long Point Break. A very modern 2 bedroom cabin with fantastic views and easy beach access at Seymour. See their website, or phone on 03 6375 1955.
Earth Land Sea. A 2 bedroom bungalow which is part of the Earth Land Sea Gallery. It's a few hundred metres along the beach from Sandpiper. See here for details.
If you are travelling to other parts of Tasmania, here are a few other suggestions:
Swansea - Meredith House and Mews.
Hobart - Apartments on Star.
Cradle Mountain - Cradle Mountain Highlanders Cottages.
Branxholm (NE Tas) - Tin Dragon Cottages.