刚才读了移民厅官方网站的FAQ:
Q7 If I have already lodged an independent skilled application, is there any way to change it to a State Sponsored visa?
If you have lodged a Skilled – Independent (subclass 175) visa or a Skilled – Independent (subclass 885) visa, your visa can be assessed as a State Sponsored visa.
To obtain a state or territory nomination, you should approach the state or territory you would like to live in and request they consider nominating you. Please note that state-sponsored migrants are expected to live for at least two (2) years in the state or territory which sponsors them.
See: Nomination by State/Territory government
If you are accepted by a State or Territory government, they will notify you and lodge the relevant nomination form directly with the department. You will also need to complete the post-lodgement form to let the department know that you have accepted a nomination and wish to have your application assessed under either the Skilled – Sponsored (subclass 176) visa or a Skilled – Sponsored (subclass 886) visa.