Sandon Shoals and the general inshore reef country off Wooli and Sandon function as the reliable, close-to-home option for Wooli Dive Centre on days when the longer runs to North Solitary Island (75 minutes) or Pimpernel Rock (90 minutes) are ruled out by weather. Sitting only about 20 minutes from the Wooli wharf, these reefs let the operator keep running trips through conditions that would otherwise cancel the day entirely, and they see correspondingly more regular use than the marquee remote sites further out. The terrain is a typical northern Solitary Islands Marine Park mix of broken rock reef, gutters and low ledges in roughly 8 to 25 m, supporting grey nurse sharks moving along this stretch of coast, turtles, wobbegong sharks, kingfish and the general subtropical reef fish community found throughout the marine park.

While it lacks the singular drawcards of Anemone Bay's clownfish density or Pimpernel Rock's giant tunnel, it offers a solid, dependable dive in a part of the park that otherwise sees relatively little attention compared with the more heavily marketed South Solitary Island grounds out of Coffs Harbour. Because Sandon Shoals is used mainly as a fallback and a training/check-out ground rather than a headline destination, published detail on named individual sites within the shoal system is limited, and much of what is known comes from the operator's own local knowledge rather than any independent dive-site database. For visiting divers booked with Wooli Dive Centre, it is worth asking directly what the plan is for the day, since a Sandon Shoals trip and a North Solitary Island or Pimpernel Rock trip are very different experiences in terms of distance, exposure and marine life density.

Wooli Dive Centre is the only operator serving this section of coast and departs from the Wooli River wharf in the small village of Wooli, reached via Wooli Way off the Pacific Highway/Grafton-Wooli Road. The river mouth has a shallow, shifting bar that the operator's purpose-built jet-propulsion vessel (able to run in very shallow water) is specifically equipped to cross; private trailer boats should not attempt this bar without strong local knowledge. From the wharf it is roughly 25 minutes to North Solitary Island's southern sites and up to 90 minutes to Pimpernel Rock in the north of the marine park, weather dependent.

Wooli Dive Centre requires a minimum group size (around six divers) to run a charter to the more remote sites. Sandon Shoals lies much closer to Wooli than North Solitary Island or Pimpernel Rock, giving the operator a reliable option on days too rough for the outer sites.

North Solitary Island and Pimpernel Rock sit fully in the open ocean north of the more sheltered Coffs Harbour grounds, so trips depend on a genuinely settled weather window — under about 1.5 m swell and light-to-moderate winds — and are cancelled more often than the South Solitary Island trips run from Coffs. The Wooli River bar itself is shallow and can be dangerous in a big swell or a strong outgoing tide; the dive centre's shallow-draft, high-powered vessel is built specifically to manage it, but the bar can still close the operation down on a bad day. Visibility offshore is normally excellent, in the order of 15-30 m, but summer brings warmer water (up to 25°C) with more current from the East Australian Current, while winter is cooler (down to about 18-19°C) but often calmer.

Cyclone-influenced swells from the Coral Sea can affect this coast in late summer/early autumn even without a direct cyclone hit.

Drop onto the shoal at 8-12 m, work the gutters and ledges down to 20-25 m looking for grey nurse sharks and turtles, and shallow up over the reef top for the ascent.

Wooli Dive Centre's default nearer-shore option when sea conditions rule out the longer runs to North Solitary Island or Pimpernel Rock.