"NSW will be the first state in Australia to address this," Ms Berejiklian said. "We know these are tough laws but unfortunately these circumstances are here because of what we see around the world and around Australia."
The Premier said the policy was "drastic" but would be modelled on existing post-sentencing schemes for violent or sex offenders.
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.
Source: Daily Advertiser