The federal government's handling of the aged care sector has been under question during the pandemic, with 685 residents dying with the virus this year.

The majority of cases were in Victoria.

Aged Care Minister Richard Colbeck said the three-tiered model would tell providers how to respond to the COVID-19 threat level in their community.

Visitation restrictions are recommended to remain at all times for people who recently been overseas, have been in contact with a confirmed case, people who are sick, need to isolate or haven't had the flu vaccination.

"Visitors will also need to maintain personal hygiene and social distance," Senator Colbeck said.

Tier three is the most extreme level and comes into effect when there is an epidemic of coronavirus in the community.

Under that scenario new and returning residents can only enter after being cleared by authorised doctors.

Only one visitor would be allowed, with partners of residents allowed with appropriate orientation and training.

The Older Persons' Advocacy Network says the new code recognises the importance of continued visits.

"Residents must have the right to have visitors and we need to find ways to enable Australians in aged care to connect with their families and friends safely," the group says.

The changes come as South Australia's six-day lockdown is due to end on Sunday - days earlier than expected.

The Parafield cluster grew by three cases to 25 on Friday, with 44 others suspected of having the virus.

The easing of restrictions comes in light of an infected hotel quarantine worker lying about also working at a pizza shop.

Authorities said it changes the need for a widespread shutdown of the state, as it meant he didn't catch the virus by being a customer but was instead a close contact of another case.

South Australia has asked the nation's expert medical panel to investigate whether hotel quarantine workers should be allowed to have second jobs.

Victoria's inquiry into its disastrous hotel quarantine system recommended not allowing workers to be employed in multiple jobs.

But there's no national guidelines directing states about employment conditions for the crucial work of patrolling quarantine.

Although the lockdown lifts for South Australians on Sunday, residents will face restrictions including density requirement of only one person per four square metres.

Number limits at gatherings such as weddings and funerals and at pubs, restaurants and other venues apply.

Meanwhile, Victoria will begin receiving international arrivals from December 7, with an initial cap of 160 travellers a day.

NSW and the ACT are due to to lift restrictions on Victorian visitors from Monday.

Australian Associated Press