No, there is not a dedicated bag available from Roland for these models.
Please use a commercially available carrying bag or case that fits the following specifications.
SPD-30
Width: 540.8 mm (21-5/16 inches)
Depth: 272.4 mm (10-3/4 inches)
Height: 87.6 mm (3-1/2 inches)
Weight: 3.8 kg (8 lbs. 7 oz.)
SPD-20
Width: 450 mm (17-3/4 inches)
Depth: 350 mm (13-13/16 inches)
Height: 70 mm (2-13/16 inches)
Weight: 2.8 kg (6 lbs. 3 oz.)