The NSW state government will seek to change the law to give it the power to send in police to dismantle the homeless camp in Martin Place, effectively bypassing the City of Sydney and its bid to resolve the issue amicably.

The move will pave the way for the eviction of dozens of homeless people who have established a tent city in Martin Place, following a long-running stoush between the government and the City.

At a press conference on Tuesday afternoon, Premier Gladys Berejiklian said the proposed legislation would be introduced to Parliament today, and was expected to pass within days, to be enforced by the end of the week.

The legislation would give the government the power to authorise the police "to be able to move in, take property and also ask people to move on if it's deemed to be a public safety issue", she said.