Prime Minister Scott Morrison announced a plan on Wednesday to evacuate Australians trapped at the epicentre of China's deadly virus and quarantine them on the remote island for 14 days.

Angela Fredericks says the prime minister must give Sri Lankan couple Priya and Nades Murugappan, and their Australian-born daughters Kopika and Tharunicaa - who have been in detention on the island since mid-2019 - a promise they won't be exposed to danger.

"This is confirmation that this is a place we use to isolate Australians, and that's exactly what they are doing to this family," Ms Fredericks told AAP.

"We want an assurance that they will not be put at risk, and even more so let's bring the family back home ... there is a whole town here waiting for them."

Ms Fredericks will visit the family next month to give support during their next legal bid to stay in Australia.

Kopika and her younger sister Tharunicaa were born in Biloela in central Queensland, however the government has rejected claims for refugee status made on behalf of Kopika and her parents.

They fear persecution if they are deported because of links to the banned militant group known as the Tamil Tigers.

Their case, which will focus on a visa for Tharunicaa, will be heard in the Federal Court in late February.

Australian Associated Press