Police have fined a 28-year-old woman for failing to isolate at home after returning to Tasmania from interstate.

The woman, who returned to north-west Tasmania from Western Australia on Sunday, was directed to isolate at her residence for 14 days.

Police identified the breach during a routine compliance check on Tuesday, finding the woman had visited two retail outlets in Burnie that morning.

She has been issued a fine of $774 for this offence.

Police continue to actively monitor people who are required to self-isolate at home, with more than 22,000 checks having been conducted since 25 March.

Non-compliance with self-isolation requirements or other restrictions can be reported here.

Information can also be provided anonymously by calling Crime Stoppers on 1800 333 000 or online at crimestopperstas.com.au