Season the salmon fillet evenly with sea salt and black pepper.
Heat the sesame oil in a non-stick skillet over medium-high heat and sear the salmon for 4 minutes per side until the skin is crispy and the center is cooked through.
In a medium mixing bowl, gently fold the rice vinegar and freshly grated ginger into the warm cooked rice.
Thinly slice the cucumber and radishes into rounds, and slice the avocado into thin wedges.
Using a fork, flake the cooked salmon into large, bite-sized chunks.
Place the seasoned rice in the bottom of a serving bowl and arrange the flaked salmon, cucumber, radish, and avocado on top.
Slice the nori sheet into thin ribbons and scatter them over the bowl.
Drizzle the entire dish with coconut aminos and serve immediately.