In a pot of boiling salted water cook the Soba for 5 minutes, or until al dente, drain and transfer to large bowl. Toss with oil. In large saucepan of boiling salted water add carrots and cook 2 minutes, add snowpeas and bean sprouts and bring water back to boil. Drain vegetables and refresh. Pat dry.
Add vegetables to bowl of pasta along with seafood and minced scallion.
Make the dressing: In blender or processor combine all ingredients and blend until combined well. Toss salad with dressing.