https://immi.homeaffairs.gov.au/visa...l-shortage-482
"This temporary visa lets an employer sponsor a suitably skilled worker to fill a position they can’t find a suitably skilled Australian to fill."
"Can it be applied for by an applicant from overseas ..."
No, read the Visa conditions, not a hope. The applicant
employer must support the application with labour market testing and employment offer documentation.
No Australian temporary or permanent residency and work Visa (except perhaps the temporary backpacker work visa) allows an applicant come to Australia "for a look around" in the hope of gaining employment.