In a large pot of boiling water, cook soba according to package instructions. Meanwhile, in a large bowl, combine soy sauce, vinegar, oil, sugar, garlic, and ginger.
Drain soba, rinse with cold water, and drain again. Transfer to bowl with soy mixture and toss. Add chicken, scallions, and cabbage and toss to combine.
BEWARE...ALL of the soba noodles that i find have wheat with the buckwheat!!! health food stores, asian stores included.