The answer is yes, but it depends. If you currently hold a COVID-19 Pandemic event visa that is about to expire you may be eligible for another COVID-19 Pandemic event visa if:
you wish to remain in Australia to continue working in a critical sector, or
you are unable to depart Australia before the expiry of your visa due to COVID-19 travel restrictions
You can refer to eligibility requirements in the department of home affairs website on this link:
Best of luck!