Now that is a bummer

Try lightly siphoning the majority of the soil from the sand path and around the staurogyne with a small diameter hose, fill into a net and gently lower to desired position behind the left rock again and as gently as possible tip out. Level as best possible with a credit card or small brush. Gently 'waft' over the plants to remove the soil from the leaves and gently rub also to remove any finer detritus. Use the syphon again to remove any remaining particles from the sand and discard as these will undoubtedly also have white sand in too which may not look the best if replaced, depends upon wether you will see it. Then carry out a large water change to counteract the disturbance and tweak tomorrow when you can see in the tank again and then do another precautionary water change.....these things are sent to try us but it will be ok, just a pita.
Just as the tank was coming together too, the plants look great together and very healthy, some taller stems at the rear will finish it off nicely, looking forward to there addition

Cheerio,
Ady