Pat the salmon fillet dry with a paper towel and season both sides with sea salt and black pepper.
Heat the sesame oil in a non-stick skillet over medium-high heat until shimmering.
Place the salmon skin-side down in the hot skillet and press gently with a spatula to ensure even contact.
Cook for 4-5 minutes until the skin is golden and crispy, then carefully flip the fillet.
Cook for an additional 2-3 minutes on the second side until the salmon is just cooked through and opaque.
In a small bowl, whisk together the coconut aminos and rice vinegar to create a light dressing.
Place the cooked brown rice in the center of a bowl and arrange the sliced cucumber, radishes, and avocado around it.
Top the bowl with the crispy salmon fillet, drizzle with the prepared dressing, and garnish with sesame seeds.