Keilor Downs College is being closed for the second time in less than a month after it was determined a student attended the school for "two days while infectious".
A spokesperson from the Department of Health and Human Services said based on the timeline, the student was infectious for two days whilst attending the college.
The school has been linked to 11 cases across nine households.
"The school will conduct a deep clean of affected classrooms and common areas. Contact tracing is under way and testing will be undertaken as appropriate," said the spokesperson from the Department of Health and Human Services.
Meanwhile, a student from St Mary's Primary School in Hampton tested positive on Saturday.
Additionally, a staff member at a Catholic school in Melbourne, St Monica's College in Epping, has also tested positive for the virus.
The school will now be closed until the end of the term, with online learning to take place for the remaining week until the school holidays.
Students have been advised to stay at home while health authorities conduct contact tracing.
Principal Brian Hanley said the safety of the students and staff remains the priority.
"I understand this news will be concerning for many of you. I want to assure you we are doing everything we can to contain and slow the spread of the virus, and ensure the health and safety of our whole school community."
Police vow to crack down on virus hotspots
Victoria's case numbers are the highest they have been in more than two months.
More than half of the new cases since the end of April have come from family members spreading it to their relatives.
"We have had particularly some concerns around family gatherings, extended family members across many households visiting each other even when they have been exhibiting mild symptoms," said Victorian Health Minister Jenny Mikakos.
From midnight on Sunday to July 12, Victorians will only be able to have five people at their homes and gatherings outside the home will be restricted to 10.
Police Minister Lisa Neville said enforcement of the law would be strengthened again after the health advice change prompted by the uptick in cases.
She said that Victoria Police had moved into a checking and reassurance strategy from June 1, following Victoria's downward trend in coronavirus positive tests.
"While many Victorians are doing the right thing - there are still some who are ignoring the restrictions," Minister Neville said.
"Victoria Police will continue to be out in force, using their powers to help slow the spread."
Plans to lift restrictions put on hold
Cafes, restaurants and pubs were set to expand their number of patrons from 20 to 50 on Monday, but this is now on hold - a blow to ailing businesses desperate for recovery.
Victorian Chief Health Officer Brett Sutton acknowledged the fatigue many Victorians could feel after the setback but warned of the risks of a second wave.
"We all want to see friends, we all want to see family, we all want the kind of psychological break of doing things that are normal," he said.
"Victoria could get to a point where we don't have to worry about this, we could drive transmission down to a point where we can get back to a substantially normal existence."
Prof Sutton also said the increase in community cases was the driving force behind positive cases in schools and warned of the risk ahead of the holidays due to start next week.
Victoria Police Deputy Commissioner Shane Patton said officers would keep a close eye on caravan parks and campgrounds during the schools holidays.
People in Australia must stay at least 1.5 metres away from others. Check your state’s restrictions on gathering limits.
Testing for coronavirus is now widely available across Australia. If you are experiencing cold or flu symptoms, arrange a test by calling your doctor or contact the Coronavirus Health Information Hotline on 1800 020 080.
The federal government's coronavirus tracing app COVIDSafe is available for download from your phone's app store.
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