South Australia will introduce tougher rules for essential workers crossing the border with a need for them to have had at least one vaccine dose.

Essential workers travelling to South Australia from high-risk states will be required to have a least one COVID-19 vaccine dose as concerns continue over virus outbreaks.

The new arrangement will target those people who arrive in SA for specific purposes and are allowed out of quarantine to conduct their work during the first 14 days.

Under the current border arrangements, it will apply to workers coming from NSW, Victoria and the ACT.

It will not apply to interstate transport workers who are allowed in according to a strict COVID-19 testing regime.

Premier Steven Marshall said the state government would continue discussions with various industry groups over the next few days, but would introduce the rules "going forward".

"There are often people who have got high-level technical skills who need to come into South Australia that can't do their 14 days quarantine," he said on Tuesday.

"We have strict conditions around these and we're just taking it to another level now.

"These are small numbers but it is a risk that we want to further mitigate against."

Also on Monday, tourism business operators rallied at parliament house in Adelaide calling for more assistance for the sector.

Spokesman Dallas Coull said with borders closed to other states, many businesses were "simply not viable".

"These businesses are suffering in exactly the same way as those in NSW," he said.

"If these businesses and staff were based in NSW they would be getting weekly state and federal assistance. Here in South Australia, we are getting next to nothing."

Mr Coull said tourism operators wanted a targeted package developed to save jobs and businesses which would be needed once interstate and eventually international borders reopened.

Mr Marshall said the impact of ongoing restrictions and border closures was varied.

"Some people are doing extraordinarily well, some people are really struggling, especially those businesses which have been linked to high levels of interstate or international tourists," he said.

"We want to support them as much as we possibly can."

The premier said SA's regions had posted seven record months in a row for economic activity.

But he conceded it remained tough for businesses that revolved solely around attracting people from interstate and overseas.

SA reported no new COVID-19 cases on Tuesday and had three active infections, all returned overseas travellers in quarantine.