There is a non-dairy yogurt available by 'Alpro' I dont know of you can get that in your area...im in the UK.
To be honest it's not that delicious to eat...not a great substitute for the real thing! It isn't creamy...more like thicker, lumpier soya milk!

You might be able to find a brand of soy yogurt that is tastier where you are. Try googling it 'soya yogurt'.

Though i don't advocate that eating alot of soya products is necessarily a good thing...i think some things are okay to have that contain soy, like the milk, the brand i get is 95% water.

Good luck with finding a tasty vegan yogurt!