Egeria densa is a good one to try, can leave it floating or anchor it in the sand and it's not super fussy.
You can grow nearly any plant in sand substrate. Root tabs are handy, but you can also get by with a quality liquid fertilizer or dry fertilizer (id go liquid, dry is a little more advanced). Plants will utilize both sources for nutrients--substrate and water column. What matters more is making sure they have what they want. Tabs are a great "safety net" for those who may not feel they can keep up regular dosing with other methods, and you can even use both together. So long as your nitrates aren't sky rocketing.
A list of easy beginner friendly low light plants:
Anubias (tie to rock or wood, do not plant in substrate)
Bucephalandra (tie to rock or wood, do not plant in substrate)
Egeria densa (float or plant)
Guppy grass (float or plant)
Hornwort (float or tie to suction cup and attach to glass, do not plant it)
Java fern (tie to rock or wood, do not plant I'm substrate, but also note your water source--this plant does like extra potassium if your water lacks enough of this nutrient)
Sußwassertang (tie or leave loose, it's a moss, stuff will grow in ambient room light) [pronounced "seuss-wass-er-tang"]
Cryptocoryne (some species get large, such as aponogetifolia and usteriana, so avoid these in smaller tanks, they reach 3-5' long over time, but many other smaller species are fantastic low light plants)
Echinodorus sp. ("Amazon swords". Most are easy but do need a lot of nutrients, hence why most people like to use root tabs with them)
Water sprite (float or plant)
Hydrocolotyle leucocephala (only in the brightest spots though, it will grow okay with kit LED lights but don't let it get shaded out. Float or anchor to something is best.)
But, you can experiment with several other kinds too. What works for one person may be really difficult for another (I kill water sprite, supposed to be super easy stuff lol) and you may find that something "difficult" for others is easy for you.