star trek - Is there a galactic map showing the homeworlds of the various humanoid species?

I don't think either would qualify as canon, but there have been two published books of maps of the Star Trek universe that might at least be seen as semi-official: Star Trek Stellar Cartography, and the earlier Star Trek Star Charts (which is out of print and pricey to get used, though somewhat cheaper used copies can be found on the amazon.co.uk page). The Memory Alpha site has an article about Star Trek Star Charts here which mentions that people who worked on the show like Michael Okuda and Rick Sternbach were consulted:

Star Trek: Star Charts was written and illustrated by Geoffrey Mandel,
with the help of Doug Drexler, Tim Earls, Larry Nemecek, and Christian
Rühl (see below). André Bormanis, Michael Okuda, Rick Sternbach, and
Timo Saloniemi gave technical advice.

There was also an older book called Star Trek Maps from 1980, but that obviously wouldn't include anything from later series like TNG.