Cognitive behavioral therapy (CBT) is one of the standard conventional treatments for posttraumatic stress disorder (PTSD). However, recent studies have reported the benefits of yoga for reducing PTSD symptoms including a Kundalini Yoga (KY) intervention. The purpose of this study was to test the efficacy of a novel combined 8-week CBT and KY program for treating PTSD symptoms and improving sleep quality in a single group trial of 26 adults with PTSD. PTSD symptoms (PTSD checklist-5) and sleep quality (Pittsburgh Sleep Quality Index) were assessed at baseline, post intervention, and at 2-month follow-up. Both CBT and yoga homework compliance were also measured. Total PTSD symptom scores as well as the cluster symptoms (intrusion, avoidance, arousal/reactivity, and negative alterations in cognitions and mood) were significantly improved following the program, all p < .01. The improvements in total PTSD scores, intrusion, avoidance, arousal/reactivity were maintained at follow-up, with all values still less (p < .01) than baseline. The negative alterations in cognitions and mood symptom cluster continued to improve further at follow-up compared to post-intervention values (p < .05). Total sleep score (p < .05) and the subscales of sleep disturbance (p < .01), daytime dysfunction (p < .05), and sleep quality (p < .01) were significantly improved after the program and these improvements were maintained at follow-up compared to baseline. Sleep medication use was decreased (p < .05) and sleep latency was improved (p < .01) at follow-up only compared to baseline. There was a significant positive correlation (p < .05) between the completion of the yoga home practice and post change in total sleep scores. These results show that a combined KY and CBT intervention resulted in decreased PTSD symptoms and improved sleep quality and suggest this program may constitute an additional treatment option for PTSD.