There are a ton of great sushi places in Toronto but there is only one I know of that will fully accommodates those living a GF lifestyle.
Sushi Supreme on Yonge Street not only carries Gluten Free Soya Sauce but they will also modify rolls to suite your needs. For example I love the yam roll but obviously can’t have have tempura so they steamed the yam instead. They also made me a mushroom rolls sans teriyaki sauce which was much appreciated.
They have two locations in the city but the one I frequent is located on 11995 Yonge Street, Toronto ON (Between Davisville subay station and Eglinton subway station)
Guilty confession: I actually brought a small container of my GF Soya sauce to the restaurant and was fully preapred to sneak it out when the food came but no need, they brought their GF brand for me when I informed them of my “food allergies”. Best day ever!