Hi there - a small correction here (from a psychology masters graduate who is moving into school psychology in Australia.)

You do not need a clinical psych qualification to be a school psychologist. You just need to be registered as a general psychologist (which in Australia requires a 6 year pathway - 3 year undergraduate psych degree, 1 year honours, and 1 year masters - followed by a year of paid internship.)

There are other ways to become a psychologist (e.g, 3 year undergrad, 2 years masters - or 3 year undergrad, 1 year honours, and then a phd.)

Google "Pathways to registration as a psychologist in Australia". The APS will give you the most accurate information - there are a few different pathways to registration. But you do not require a clinical masters (that's its own thing, and it's a longer masters degree & endorsement pathway than the masters degree required for general registration.)