Environmentalists will challenge a state planning tribunal's decision to back the Lake Malbena ecotourism project in the Supreme Court.
The Resource Management and Planning Appeal Tribunal last month decided to overturn the Central Highland Council's decision to block the project, finding in favour of appellants Daniel and Simone Hackett.
The venture involves a standing camp on Halls Island and helicopter flights in and out of the Tasmanian Wilderness World Heritage Area.
Tasmanian National Parks Association president Nicholas Sawyer said the Supreme Court appeal challenged the tribunal's ruling that it could rely on a reserve activity assessment by Tasmania Parks and Wildlife Service to determine the project's accordance with the Tasmanian Wilderness World Heritage Area Management Plan.
He said the tribunal's decision had implications for other tourism projects being considered in reserved areas and parks under a government-run expressions of interest process.
Court hearings are expected to start later this year.