Prepare bananas by peeling and cutting lengthwise into two halves. Roll in sugar.
Separate wrappers into individual sheets. On a flat working surface, lay wrapper like a diamond. Arrange 1 banana slice in the middle of diamond and place 2 to 3 jackfruit strips lengthwise on top of banana slice. Fold bottom pointed end of wrapper over filling. Fold side ends of the sheet inward and roll into a log. Wet the pointed edge of the wrapper to completely seal. Roll sealed springrolls in sugar. Repeat with the remaining bananas.
In a skillet over medium heat, heat about 1-inch deep of oil. Add banana spring rolls seam side down and fry, turning once or twice, for about 3 to 5 minutes on each side or until crisp and golden brown.