Aside from Commander Data and Lore being the only android we have seen (and some earlier prototypes), and since the Borg do not qualify as being androids, are there any fully sentient android race in Star Trek Universe, either in Canon or non-Canon?
The definition of artificial life is a hot button topic in the Federation. Some people see them merely as tools, while others see them as full fledged life forms. However, to answer your question, there are a couple of example of groups of androids that have been seen in Star trek. Whether they qualify as sentient races, however, is a question for the philosophers. Note that Data is not the only Soong type android we see.
- the Mudd Androids (questionable sentience)
- the Automated Personnel Units (questionable sentience)
- Ruk (and the Exo III androids)
- Rayna Kapec
- any Soong type android
Special mentions (not androids, but sentient artificial life nonetheless).