The new orders will be effective from 11.59pm on Tuesday, April 12.
In making the declaration, the state government said there remained a “serious risk to public health” throughout the state from COVID-19.
One factor included the recent increase in case numbers and the anticipated Omicron subvariant BA.2 wave.
Mr Andrews said the extension enabled the state to keep modest and sensible settings in place to reduce COVID-19 transmission.
“That means more support for health workers and limiting its impact on our community,” he said.
“We don’t want rules on any longer than they need to be – we’ll continue to follow the advice to protect what we’ve built while protecting our community.”
Mr Andrews said the declaration was made after consultation with and consideration of advice from the Minister for Health and Acting Chief Health Officer.
A pandemic declaration gives the Minister for Health, currently Martin Foley, the authority to make pandemic orders he considers reasonably necessary to protect public health.
The reasons for the extension and the advice from the Chief Health Officer will be tabled in parliament.
The new extension will expire at 11.59pm on July 12 and any subsequent extensions can last for up to three months.