Rinse the sushi rice under cold water until the water runs clear.
Cook the sushi rice according to the package instructions.
While the rice cooks, prepare the marinade in a bowl: combine soy sauce, sesame oil, and rice vinegar.
Add the diced salmon to the marinade, gently mixing to coat all pieces evenly.
Once the rice is cooked, let it cool slightly before fluffing it with a fork.
Assemble the bowl by placing a generous scoop of rice at the bottom.
Top the rice with the marinated salmon, then arrange avocado, cucumber, radishes, and green onions artfully around it.
Sprinkle sesame seeds over the top for added crunch and garnish.