Sir I want to apply visit visa for Australia maybe...

In accordance to your query, we would like to clarify that if you want to obtain a tourist visa to Australia.
If you are a GCC national, you can obtain a tourist visa online, through the Australian Immigration Information website, on the link below:
Visa
- If you do not have nationality of any GCC countries, you should check the Australian Embassy, ​​and attach the following documents:
- Valid passport for not less than six months.
- Hotel booking.
Booking of flight tickets.
- Approval from your employer for the trip.
- Bank statement for the last six months.
- Salary certificate.
The embassy employee has the right to request any other documents that considered necessary.
The Australian Embassy in Saudi Arabia is responsible for granting visas to a person who has residence in the Sultanate of Oman.
For more information, we recommend that you review the website of the Australian Embassy in the Sultanate of Oman
The Australian Embassy in Saudi Arabia