(The N in this name is pronounced like 'n' in 'no'. The DH is pronounced like a hardened sound of 'th' in 'bother'.)
Sougandhikam was the name of a divine flower. The garden in which the flowers grow is also called Souhandhika. The garden was guarded by many yakshas.
That flowr fell before droupadi when they were living near mount Gandhamaadanam. She sent bheema to fetch more of those flowers. Bheema went to bring them and met Hanumaan in the way. He killed many yakshas and brought the flowers.