The Premier's comments come the day before the Council of Australian Governments, a meeting of Australian state and federal governments on Thursday where strengthened national security policies will be high on the agenda.
But the NSW Council for Civil Liberties said there was no need for any extension of post-sentencing policies.
"It can only be [a] political [measure]," said President Stephen Blanks. "It's just an abuse of what the courts are there for, which is to find truth.
"This is a regime which will result in the continued detention of people simply for what they say or think. It's fundamentally contrary to the idea of a free society".
The Premier said her government was still considering the details of a federal government proposal to grant its authorities access to states' databases to harvest licence photos that could track suspects using facial recognition technology and surveillance footage.
But Ms Berejiklian said the NSW government generally supported strengthening national security protections.
"All of us have to accept, from time to time, that our civil liberties aren't what they used to be," she said. "I'm keen to support any measure that supports public safety.
"I think all the community would expect us to have a no regrets policy; I don't want us to say what could we have done?
"Sometimes it means all of us have to give up a little bit of our civil liberties.
"It's not a 'maybe' threat; the threat in NSW is probable. When the threat is probable you need to look at what you're doing." Berejiklian said.
Source: Sydney Morning Herald