Short Answer
No. You cannot legally get married online in Tasmania or anywhere else in Australia.
The marriage itself must happen in person.
What Has To Be In Person
For the marriage itself:
- both people must be physically present
- the celebrant must be physically present
- two adult witnesses must be physically present
What Can Be Done Remotely
Some parts of the process can happen remotely, including:
- booking
- email communication
- document review
- general planning
- in some cases, remote witnessing of the NOIM by audio-visual link when an authorised witness offers that service
Important Difference
You may be able to prepare or witness the paperwork remotely.
You still cannot be married remotely.