Tasmania's Liberal Opposition will open up the state's national parks and World Heritage areas to development, if it wins next month's state election.

Developers will be invited to submit eco-tourism ideas, and those deemed appropriate will be required to tender.

Successful projects will be given an exclusive development licence.

The party says it is deliberately not specifying any area for development and wants to encourage ideas.

Developers will be welcome to give money to conservation, but there will be no requirement to do so.

Opposition Leader Will Hodgman says normal planning safeguards will apply, including environmental impact.

Mr Hodgman says there have been missed opportunities to encourage eco-tourism in the past few years.

"This is one of our most competitive advantages - our natural beauty, our environmental assets," he said.

"We should be using them sensibly, sustainably, into the long term, so we can create more jobs in this space."

The party says it is part of a broader plan to create 8,000 tourism jobs by 2020.

The state's Tourism Industry Council estimates 16,000 people work in tourism at the moment, with another 22,000 indirectly supported by it.

Opposition parks spokesman Matthew Groom says he is certain the policy will create jobs.

"I'm not going to name specific people, but we've spoken to people who are involved in tourism, who are involved in development opportunities in these types of areas and they have indicated to us that they think there are opportunities," Mr Groom said.

Policy not needed: Premier

The Premier, Lara Giddings, says the policy is unnecessary because tourism projects can already be developed in national parks.

"The fact is there is already development in national parks, you already have Cradle Mountain huts that have been built in beautiful World Heritage areas," she said.

"You have opportunities right now with development, as well, with our peninsula development, with our Three Capes track."

But the tourism council's Luke Martin says it would be a significant change.

"Currently the system is very much based on prohibition, very much trying to I guess, make it challenging for people who want to put up ideas," he said.

"This is actually saying we want these ideas, we want to support them, and create iconic tourism experiences across regional Tasmania."

The Greens leader Nick McKim has criticised the Liberals' plan, saying it is inconsistent with other Liberal plans.

"Their policy around [the] World Heritage area makes no sense whatsoever," Mr McKim said."They're proposing to log in the Tasmanian World Heritage Area and at the same time they're proposing tourists go and see, what? Industrial scale logging activities? I don't think so."

Brown fears 'open season'

The former Australia Greens leader, Bob Brown, says he doubts the policy is about encouraging low-impact projects.

"They always do say it's going to be sensible and they say in one breath it's going to abide by the planning laws and they say in the next breath they're going to strip the planning laws away," he said.

"This is open season, anything will go."

He fears it will open up development in Wineglass Bay, Dove Lake near Cradle Mountain and the Franklin and Gordon rivers.

He is likening the idea to landmark environmental disputes in the 1980s.

"The difference between now and when Robin Gray wanted to put a motel on the Franklin River is there's a Federal Government that's going to say yes to it."

"It's a very dangerous configuration. People who value our national parks and wilderness area can't vote Liberal after Hodgman's announcement."

Peter McGlone from the Tasmanian Conservation Trust says the existing arrangements should not be changed.

"Whilst the development approval processes for national parks and reserves is difficult, hundreds of tourist operators are currently working in our national parks and reserves system," Mr McGlone said.

"They get through the process, which is somewhat laborious, but it's important to have an assessment process."