Indeed - you're looking for the original expansion pack that came out way back when, right?
Yup, that's Tales of the Sword Coast, and it's not playable as a separate game, but only as part of a BG1 playthrough, so it's not available as a separate option. (IIRC, the original TotSC installation back in the disc days included a pre-generated savegame with characters of appropriate level and chapter progression to directly proceed to the TotSC content; I'm not sure off the top of my head if Beamdog included that save in the EEs)
On the other hand, BG2's expansion takes place after the completion of the story proper within (except for one dungeon that can be accessed in both the original chapters as well as the TOB ones whenever you have world map access) entirely separate zones, while Icewind Dale's expansion was designed from the get go to allow standalone play, so both of these are available as direct options from the main screens of their respective games.