What you’re worried about is that someone in Australia jumps online and buys perfume from somewhere in japan. That Japanese person sends the goods to Australia.
So you as the exclusive distributor in Australia want to try and ensure that you are the only person that has the rights to sell in this case perfume in Australia.
So what you can do is you can make a clause in the agreement with the supplier. That [clause] mandates that if you become aware of any goods being sold in the country, then you can tell the supplier.
They can then take action against the relevant third party that has been supplying goods into in this case Australia.