Docker image with 2 subnets

Is there anyway to have a docker image connect to two subnets. What i have is two routers. One is setup for all my devices on an asus router. My other router will be set up for device tracker devices using tomato. I have found the asus router to do poorly with this so this is why i am asking. I am sure there is a better way to do it but this is what i could think of. I have both routers setup and working but i cant get my docker to see the 2nd router