I'm finishing my HT and I'd like to add 4 wall sconces. Is it possible to wire the sconces without tearing up the drywall? I'm in a bottom floor condo with no basement or attic.

Depends on what type of access you have either up or down. I you have access either up to an unfinished atic or down to an unfinished basement (or drop ceiling) you might be able to snake it. Can be tricky depending on the type of wall and when it was built.

Taller walls may have required fire stops (short 2x4s running horizontal between studs) in ceiling over 9' or so depending on code and when it was built.

I have very little experience messing with this but have an electrican friend and this can get fustrating in a hurry for even those who know what they are doing. Not saying it can't be done but you will at a minimum need access either up or down. And then a little luck helps too. Builders can throw all kinds of crap in empty walls so you never know what you will get unless you built it yourself.

Yes, it is possible. However, we need more information and maybe some pictures and we can help give you some ideas.

Also need to know things like where is the switch and what else is around. Interior or exterior wall, etc.

Depends on what type of access you have either up or down. I you have access either up to an unfinished atic or down to an unfinished basement (or drop ceiling) you might be able to snake it. Can be tricky depending on the type of wall and when it was built.
No basement or attic, I updated the OP. I'd like to avoid patching, sanding and repainting the drywall, which may not be possible.

4 options:

-Tear up drywall and repair after wired.
-Electical conduit attached to walls (looks like crap).
-Battery powered.
-Pixie dust.

Other options

1) surface conduit hid behind wall treatments

2) remove baseboard molding perform surgery on wall to run romex in wall, replace molding hiding surgical scars.

3) add side wall columns and crown molding and use those to hide all wiring,

4) hide wiring in an appropriate wall mounted chase such as a base board style.

5) hire a skilled electrician.

Pixie dust it is! I'd have to tear up 3 walls to do it, which isn't an option. I guess I'll just try to find a nicer ceiling fixture. The lights are off when I enjoy the room the most anyway, right?

If you have a plain flat painted finish (no faux finishes, wallpaper, textures, etc), then drywall patches are relatively straightforward and can be made to be totally invisible.