Stricter supervision orders and mandatory rehabilitation programs for criminals are among the new sentencing laws to be rolled out across New South Wales tomorrow.

The sweeping reforms were first announced in May last year following recommendations by the NSW Law Reform Commission in 2013.

In place of a suspended sentence, courts will now have the power to issue Intensive Corrections Orders (ICOs) which will make supervision and targeted rehabilitation or deterrence programs mandatory.

NSW Attorney-General Mark Speakman said the changes would reduce "ineffective suspended sentences" which currently do not require courts to impose supervision or rehabilitation orders.

"We know that when people get suspended sentences or good behaviour bonds, they would be less likely to re-offend if there was some intervention in their behaviour while they're still out in the community," Mr Speakman said.

"[The changes] give courts more flexibility to impose sentences that not only fit the crime but fix the criminal, with a greater emphasis on rehabilitation and supervision."

The changes will apply to indictable offences at the district and local court level, and exclude serious offences such as murder, sex offences, and terror-related convictions.

Mr Speakman said the flexibility of the reforms would reduce incidents of courts determining an offender was not eligible for work programs due to mental health or substance abuse problems and therefore imposing no requirements on the offender.

"Often judges say, 'well I won't impose an order at all because it won't work in this case'."

"My job is to make sure we have appropriate laws in place that protect people and protect communities and these sentencing laws will do that."

Mr Speakman said the orders can continue even after a sentence is complete, in extreme cases.

"Not only are we beefing up the array of conditions that are available, we can tailor it to the specific offender," he said.

"They make the community safer by encouraging offenders to enter early appropriate guilty pleas and in extreme cases keep the most high-risk offenders in detention or under supervision even after their sentence ends."