No, they are VU, VY or VZ utes with canopy. "Sandman" as we know it (otherwise coded as XX7 and later XU3) was a defined vehicle package, consisting of a few vehicle models upon which the option code of XX7 (HQ-mid HJ) or XU3 (mid HJ-HZ) was added. In HQ it consisted basically of:

1. A few component options like XS6 (buckets) and N66 (Rally type wheels).

2. Feature changes, like GTS front fenders, blackouts, deletion of rocker mouldings (380, 480).

3. A decal package for dealer fitment.

By the time HX was released you could significantly modify the Sandman package in two ways only:

Ordering XX7 package instead of XU3 package - gave you passenger tyres.
Choosing DL7 - delete stripes.

Of course you could option any other options available on the parent vehicle eg V8, auto, aircon, power steering, mudflaps etc.

So having digested all that, the whole concept that the Sandman was anything special should be quashed. It is not a model (like Premier wagon, Kingswood utility etc). It was not a premium performance option package on a lesser vehicle (like XU1 on GTR, L34 on XU2 on SL/R or XW8 on HQ Kingswood). It was simply an option package available on a few commercial models that gave you more options for a better price than you would have been able to build yourself plus some feature changes not available as options on that model (eg GTS guards). It is identical in most ways to other packages like Vacationer, Ambulance, Taxi etc. In today's terms we are talking Vspec on top of Calais or SS or other such packaged options on Cruze, Commodore, Holden, Statesman whatever.
Back to Holden putting canopies on a ute and calling them Sandman is no different to putting bolt on flares on a Cruze and calling it a Torana. Or any of us painting up a modified WB and putting Sandman stripes on it, and calling it a Sandman!

Geez, what a long winded way to say no!