People living in regional New South Wales will be permitted to travel into South Australia from 12.01am ACDT tomorrow, but a hard border will remain to those from hotspots in Sydney and Brisbane.
According to SA Premier Steven Marshall low case numbers in regional NSW means the state's transition committee is comfortable to relax border restrictions.
The only requirement for those travelling into SA from regional NSW is that they get tested on days one, five and 12 on arrival in the state.
A hard border will stay in place for hotspots in NSW including Greater Sydney, Wollongong, Central Coast and the Blue Mountains.
Travellers from Greater Brisbane will also not be allowed to enter SA.
"I know that it's been hugely inconvenient, and I know people were hoping that we could do that [open to Brisbane] yesterday or today," Marshall said.
"But we're not in that position at the moment and there are still some worrying concerns there.
"We're hopeful it will be done in the coming days."
SA recorded two new cases of COVID-19 today, both in hotel quarantine.
Updated at 4.54pm AEDT on 13 January 2021.