Where does “sandet” come from?

sandet (Norwegian Nynorsk) comes from Norwegian Nynorsk sand, from Old Norse sandr, from Proto-Germanic samdaz, from Proto-Indo-European sámh₂dʰos, from Proto-Indo-European sem- — together, one.

Ancestry of “sandet”, step by step

Step	Language	Word	Meaning
1	Norwegian Nynorsk	sand	sand
2	Old Norse	sandr	sand; sandbanks, sands, sandy ground
3	Proto-Germanic	samdaz	sand
4	Proto-Indo-European	sámh₂dʰos	sand
5	Proto-Indo-European	sem-	together, one

Every word from Proto-Indo-European sem- →Every word from Proto-Indo-European sámh₂dʰos →Every word from Proto-Germanic samdaz →