Preheat oven to Line 12 muffin cups with paper liners. Stir together flour, salt, and baking soda in a bowl and set aside.
Beat eggs in a large bowl with an electric mixer, gradually adding white sugar.
Add flour mixture alternately with sour cream. Gently fold in blueberries. Scoop batter into prepared muffin cups, filling each nearly full, and sprinkle with coarse sugar.
Bake until a toothpick inserted in centers comes out clean, 20 to 25 minutes. Cool in pan on a wire rack 5 minutes, then remove from pan and let cool completely.