Chief Minister Andrew Barr has warned Canberrans would probably not be able to move freely within the territory in the event of a hard border closure with NSW.
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Instead, it would likely come in conjunction with a lockdown in the territory.
"Our absolute late resort would be a border closure with NSW," Mr Barr said.
"But if you are going to that extent it is highly likely you would also be having to entertain further lock downs within the ACT.
"The circumstance in which we continue on our merry way, thinking that the virus can swirl around us as close as Queanbeyan and that we can live our lives normally in the ACT is not a likely scenario."
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He said the ACT was working on a range of contingencies, including softer border restrictions working with the greater Canberra region.
The government on Thursday announced the territory would delay moving to Stage 3 of eased restrictions for at least another week.
It came as NSW recorded another day of double digit increases in case numbers.
Mr Barr said the ACT would continue to be very cautious when it came to further easing of restrictions.
"What I don't want to do is be in this situation where you ease restrictions and then you have to clamp back down," he said.
"We are better being cautious now and holding our current condition than easing restrictions and having to reimpose them at a later date."
He said the next week would be crucial to determining the level of community spread of the virus in NSW.
Any travel restrictions barring people from Sydney or certain hotspots entering the ACT would occur on the advice of the chief health officer, Mr Barr said.
As of Thursday, the ACT had just one active case of the virus.
It has been about two weeks since the last case was confirmed in the territory.
Health Minister Rachel Stephen-Smith announced a new drive-through coronavirus testing clinic would open in Kambah.
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She said it would be located in the northern carpark of Jenke Circuit and would be up and running by the end of next week.
"Members of the public seeking testing will remain in their cars and there is no risk to the local community," she said.
"Security staff will be present 24 hours a day."
A new clinic was opened at Garran Oval earlier in the month.It was originally touted as a drive-through and walk-in clinic, but the government has since abandoned the drive-through element.
Canberrans can also be tested at the EPIC through-through and Weston Creek walk-in centre.
The public can also access free testing, by appointment, at YourGP@Crace and Lakeview Medical Practice in Tuggeranong.