Ethno World 6 includes a single Nadaswaram multisample (about 8 notes per octave, 2 velocities).
SwarPlug is a dedicated Indian instrument synthesis engine using sample-based modeling. Their Nadaswaram expansion is interesting because it supports MPE (MIDI Polyphonic Expression) – e.g., with a Roli Seaboard or LinnStrument, you can slide pitch per finger. nadaswaram plugin
This is a broader pack (includes Veena, Mridangam, Violin, Flute, and Nadaswaram). The Nadaswaram is simplified. Ethno World 6 includes a single Nadaswaram multisample