Violent criminals will be subject to the same post-sentence monitoring and as sex offenders and some will even remain locked up, in Victoria's $308 million justice overhaul.

Those deemed by a court as unsuitable for release into the community at the end of a prison sentence will be sent to a 10-bed facility to be built within the existing prison system.

Others will be subject to electronic monitoring, curfews, no-go zones and strict reporting requirements, it was announced on Thursday.

The Sex Offender Response Unit, made up of police, intelligence analysts and corrections staff, will manage the expanded scheme and a new authority will be created to oversee unit.

It will all be a part of $308 million package to implement the recommendations of the Harper Review.

The review was prompted by the murder of 17-year-old Masa Vukotic at the hands of Sean Price, who was in the community on a supervision order in 2015.

Law and order was the major theme of the government's pre-budget announcements on Thursday.

Premier Daniel Andrews and Police Minister Lisa Neville also announced where some of the first 300 new frontline officers will be walking their new beats.

More than 100 new officers will go to west to Wyndham, Maribyrnong, Melton and Brimbank; 89 are headed north to Hume, Moonee Valley and Moreland; 50 are going to the southeast; 45 to Whittlesea and 10 to Geelong.

The new recruits are a part of a $2 billion announcement made last year, with the funds set aside in next week's budget.

In other budget announcements, a $15.56 million package responding to the fatal thunderstorm asthma emergency was committed and $3.9 million is set aside for Geelong's Kardinia Park redevelopment.