i think sanskrit was heavily influenced by dravdian languages at some point, many many words in sanskrit have the dravdian sounds i notice. As a baloch from pakistan, i can understand several languages from the region, balochi, urdu, Dari/Farsi( atleast a lot of it) Pashtu, even Punjabi and hindi. And one thing i can clearly see is that Indic and Iranic languages though related are very different sounding, there might be a lot of similar words in the two language group however the sounds and pronunciation is a lot different in the two groups and make it sound two compleletly different language group. (Urdu) actually has kinda bridged that gap because Urdu has roughly 20-25% farsi words, however if you listen to other indic languages which were not influenced by farsi in recent times, they sound very different from Iranic languages and have more dravidian tone to the languages.
I personally think eastern european languages are actually more closer to farsi and other iranic languages in sounds and pronunciation of words then lets say most indic languages.
The famous indian accent which people make fun off here in the west is actually a dravdian sounding accent, I think Sanskrit has been heavily influenced by that accent over the centuries and words have been changed to sound more dravdian, that (dasa) example is good one