NSW has recorded a further 174 patients with COVID-19, taking its total number of confirmed cases to 1791, including 207 without a known source of transmission.
Police, meanwhile, say new plans to quarantine all international arrivals in hotels for two weeks have kicked off without incident.
NSW Health Minister Brad Hazzard says 24 people are currently in intensive care but no new deaths have been reported overnight, with the state toll remaining at eight.
Among the new COVID-19 cases are two teachers and a student from Normanhurst West Public School and a staff member at the hospital inside Long Bay prison.
The number of cases diagnosed in Australia from the Ruby Princess cruise ship has spiked to 215 - with 189 of those cases diagnosed in NSW - after passengers disembarked without adequate checks.
Mr Hazzard has again urged people to follow the guidelines to self-isolate and take precautions around social distancing.
"We have still thousands of people coming in, our citizens and permanent residents, returning from some of the most dangerous places in the world for COVID-19," he said on Sunday.
"To have this measure will hopefully make a huge difference to ensuring those people are not out and about in the community until they are appropriately checked and quarantined.
"The entire world has an enemy that is moving through it, an unseen enemy that doesn't have borders."
Coronavirus cases in NSW without a known source of transmission on Sunday lifted from 170 to 207.
This is the primary statistic by which authorities are gauging the success of shutdown measures in halting the virus' spread.
NSW Police Commissioner Mick Fuller on Sunday said of those who have arrived at Sydney Airport on Sunday, about 30 reported respiratory symptoms.
"They've undergone coronavirus testing which takes six hours, so they'll remain in that higher health testing area and higher level of isolation until we get to the bottom of it," Mr Fuller said.
About 2500 people are expected to arrive in Sydney on Sunday, all of whom will be escorted by Australian Border Force personnel to their hotels.
"Normally it would take three to six months to plan an operation like this and we pulled this together in 24 hours," Mr Fuller said.
It's not yet clear if NSW will enforce harsher rules on gatherings, after Prime Minister Scott Morrison on Sunday night advised of a two-person limit for public gatherings.
It will be up to the individual states and territories whether it is strictly enforced by police.
"This is the strong advice of all states and territories, that unless it's your household - the family, those who are living at your residence - being with only one other person as a gathering outside is what is required," Mr Morrison said.
Mr Hazzard on Sunday slammed a group of medical professionals who, after returning by plane on Friday from South America, allegedly ignored directives to self-isolate in hotels.
A number instead flew to their interstate homes.
"I'm bitterly disappointed they chose to ignore a safety measure for themselves and others - they are the people who you would expect to know better than anyone else," he said.
Australian Associated Press