The council's own words for this locality describe two centres, not one. The Coolum local plan intends the Coolum Beach Town Centre, centred on Birtwill Street, to function as a District Activity Centre, and it names a separate Coolum West Local Centre along Yandina-Coolum Road and South Coolum Road, with medium and high impact industry zones sitting to the west of Coolum Beach. Those are two ends of one suburb name, described separately because the council treats them as separate places. That is a description of land use, not a requirement on any roof, and no zoning is asserted here for any particular street or parcel.
Set that against the Code. NCC 2022 Housing Provisions Table 7.2.2a sorts environments by a single measure, distance from breaking surf, and one suburb name here covers every category the table defines that way, from Very High at typically within 100 m of breaking surf out to Medium at typically more than 1 km, the least severe of them. Those are thresholds to measure against. Naming them is as far as this page takes them, because the answer depends on where a given roof actually stands, and that is not something a page can know.
Which leaves one limit worth stating plainly rather than burying. No distance from breaking surf has been measured or published for any address, street or lot in this suburb: the figures in circulation are derived from published boundaries rather than measured, so none is asserted here. That makes an exposure position at a Coolum Beach address something to establish before a specification is set, not something to look up. What that leaves a homeowner is short and useful: a datum, a set of thresholds, and a document to read them against.