In case you're still looking, I decided to go through my old CDs after I saw this as I remember downloading a SA2 SFX pack off this website 4 years ago.
I'm not sure who it belongs to (no text file) but it contains the sounds you may need. Sonic Jump, chaos drive, enemy destroyed, Grind, ect...
http://www.mediafire.com/?n1ml5p9g8g4b6t2
I haven't found anything so far. Worst case scenario, you could download the PC demo of SADX or Sonic Heroes, turn the music off and record the sound effects with Audacity or something while you play.
(...or, provided you have the original game - of course - do the same thing while running SA2 on Chankast)