Heavily armed police will be deployed across Sydney ahead of a rapid response unit established in the wake of the Bondi Beach terror attack becoming fully operational.

The government of the Australian state of New South Wales (NSW) on Thursday said that officers from the state police force's new Armed Response Command (ARC) will begin patrolling Sydney over the coming weeks as the unit's training moves into realistic environments.

The ARC was established as a permanent unit by the state government following the fatal mass shooting of 15 people at a Jewish holiday celebration at Bondi Beach in December last year.

NSW Premier Chris Minns, Police and Counter-terrorism Minister Yasmin Catley and Police Commissioner Mal Lanyon said in a statement on Thursday that ARC officers will patrol high-risk areas, including places of worship and major events, and rapidly respond to emerging threats.

The 250-officer unit will have access to combat assault rifles and 24 purpose-built vehicles and will be supported by a specialized operations center.

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"Keeping the people of New South Wales safe is our number one priority. That means making sure our police have the people, training and equipment they need to respond to serious threats," Minns said.

Lanyon said that the ARC would act as a deterrent for anyone who wishes to commit harm, incite hatred or cause fear.