You can apply for the subclass 600 visitor visa online.
Subclass 600 Visa Application Forms Australia
All of Australia’s tourist visas can be applied for online, including the visitor visa 600 form.
If you are applying for the sponsored family stream, as the name implies, you will need a family member to sponsor you. They need to complete their own application form, as a sponsor. The sponsor will need to complete Form 1149 Australia.
Australian visitor visa application – Applying Online
To apply for an Australian visitor visa online and find the Australian tourist visa application form, you will first need to create an ‘Immi Account’. You can do that here: https://online.immi.gov.au
Once you have set up your immi account, you can follow the steps in the portal to apply for your visa. This is also where you attach your documents and pay your application fee. Remember to link your application with other family members. You all need to apply separately, but the Department can assess them in a batch.