I saw it in the sea very close to the beach in front of Starfish Hotel in St Lucia. It had some spines along its back and it seemingly had fins on each side that split open into 4. It used its front two fins to dig through the sand. It had white spots, and the main colour of it was very dark brown - black. The fins on the fish were very thin and flimsy-looking.
From tail to head was probably around a foot long, and the end of one fin to another was around 15-20 cm.
Here is a link to a video I took seeing as the picture may not be clear enough- https://drive.google.com/file/d/1PzjgzAaK6B51jg9HHNO4SQyorepsdKLB/view?usp=sharing 
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$\begingroup$ Welcome to Biology.SE! It will improve your chances of getting an answer if you include an estimate of the size of the organism. Clearer photos would also be very helpful, but I understand that may not be possible. Please edit your post to include this essential information. (For future reference, identification questions should always be given the species-identification tag.) ——— Please also take the tour and then go through the help center pages starting with How to Ask questions effectively on this site. Thanks! $\endgroup$– tyersomeCommented Aug 4, 2021 at 18:06
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$\begingroup$ The array of fins brings Lionfish to mind, bit I have no idea if this is what they look like from above. $\endgroup$– bob1Commented Aug 4, 2021 at 21:02
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$\begingroup$ @bob1 I just looked up images of them from above. It doesn't look like it, if you ask me. It almost has a pufferfish-like body. media.sciencephoto.com/image/c0153618/800wm/… $\endgroup$– dinoplaysrugbyCommented Aug 5, 2021 at 9:34
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$\begingroup$ Yeah, and I haven't been able to find a list of fish species with pictures from the area either... lots of sport fishing species, but nothing for the in-shore or estuarine. $\endgroup$– bob1Commented Aug 5, 2021 at 9:41
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Based on the location, size, behavior, and shape (particularly of the pectoral fins) this appears to be a flying (or helmet) gurnard (Dactylopterus volitans) with its "wings" folded.
These range of these fish includes the Caribbean and they are known to use the forepart of their pectoral fins (i.e. the free extra 'fin' near their head) for "exploring the bottom" 1-3, which fits the behavior you described.
The size is also reasonable since they are said to reach up to 50 cm in length.
Image below for comparison — note these fish are described as being highly variable in coloration.
Image © slebris from iNaturalist some rights reserved
References:
Roux C; Dactylopteridae. In: Miller, P. J., Whitehead, P. J. P., Bauchot, M. L., Hureau, J. C., Nielsen, J., & Tortonese, E. (1986). Fishes of the North-eastern Atlantic and the Mediterranean. Vol. III. Richard Clay Ltd, Bungay, United Kingdom.
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$\begingroup$ Excellent choice, It didn't even cross my mind that gurnard would be present there. $\endgroup$– bob1Commented Aug 9, 2021 at 22:24
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$\begingroup$ @bob1 —— Thanks — gurnards do have a surprisingly wide range. I actually stumbled on this while I was researching a comment suggesting the OP look on iNaturalist since they clearly weren't going to get an answer here! $\endgroup$– tyersomeCommented Aug 11, 2021 at 23:30