Heat 1 tablespoon olive oil in a frypan over medium heat. Add sausages and cook until browned and firm, about 10 minutes. Cut sausages into 1/2 inch slices, return to the frypan and continue cooking until no longer pink. Drain sausage slices on a paper towel lined plate.
Meanwhile, heat 1 tablespoon olive oil in a saucepan over medium heat; stir in onion and cook until the onion softens and turns translucent, about 5 minutes. Add garlic and 1 1/2 teaspoons Italian seasoning; cook until the garlic softens, about 2 minutes. Pour in crushed tomatoes, water, salt, sugar and remaining 1 tablespoon Italian seasoning. Bring to a simmer then reduce heat to medium-low, cover and simmer for 20 minutes.
Bring a large pot of lightly salted water to a boil. Add gnocchi and cook for 2 to 3 minutes until gnocchi floats; drain.
Meanwhile, stir Italian sausage slices into sauce to rewarm. Toss gnocchi with sauce and sprinkle with chopped parsley and grated Romano cheese to serve.