Preheat the oven to 400 F.
Heat the olive oil on high and add the salmon fillets for 2 minutes on each side. Remove the salmon to a plate and set aside.
In the same skillet, add the shallots and thyme sprigs and cook briefly. Add the white wine and tomatoes and simmer 5 minutes. Place the salmon fillets in the pan on top of the tomato sauce and transfer the pan to the oven. Bake for 6 minutes.
Remove the pan from the oven and transfer the salmon fillets to a plate. Add the white beans to the tomato sauce and heat through. Season to taste with salt and freshly ground black pepper and just before serving, stir the spinach into the mixture to wilt.Discard the thyme springs.
To plate, spoon the tomatoes, beans and spinach to a plate or shallow bowl and top with the salmon.