Your landlord has a right to show the property to prospective buyers, but this must be balanced with your right to quiet enjoyment.
It may be possible to negotiate an agreement with your landlord or agent that strikes a balance between your right to quiet enjoyment and their right to inspect. The agreement should be in writing and signed by yourself and your landlord or agent.
An agreement can include conditions such as:
If the inspections become too frequent, you can apply to the Tribunal for a Restraining Order.
Further information can be obtained from here.
https://tenantsvic.org.au/advice/during-your-tenancy/your-landlord-is-selling/
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