Can this 15 year old scar be removed? (Photo)

I would say that your best option for removal of your old burn scar would be surgical excision.  Ideally, you would be trading your current scar for one that is thin and less noticeable.

Keloid scars are characterized by their growth potential and increased degree of inflammation within the skin. Unlike non-inflamed scars, keloids have the potential for growth beyond the original footprint of injury. Our office specializes in the management of keloids, whether single or multiple, using a combination platform that includes lasers, RF, scar modulation, Parke-Davis Scar Protocols, and injection therapy. Some keloids will require surgical intervention as an initial step for treatment.
Best, Dr. KaramanoukianRealself100 Surgeon

cosmelan peel at home now and dermarolling  then in office fraxel or halos will do very well for this scarring.
there are many options for hypertrophic scars:
1. vascular lasers (yellow laser, vbeam, excel v)
2. fractional lasers (fraxel, erbium, co2)
3. microneedling/PRP
4. silicone based scar gels with growth factors
5. excision 
see an expert.
Best, Dr. Emer.

Admittedly, the photo does not optimally delineate the scar. However, speaking generally, surgically excising the scar will still leave a visible scar, especially in a mobile region and a region under tension. Professional medical microneedling can help to break up the scar tissue and stimulate new, native collagen and elastic fiber synthesis to improve scar texture, but, especially if accompanied by the application of topical pigment promoters, such as bimatoprost and tyrosine, may even lead to significant repigmentation and blending of the scar with the surrounding normal skin. It would be wise, before jumping into surgery, to discuss this option with a board certified aesthetic physician with experience and expertise with professional medical microneedling in the treatment of scars. Best of luck and stay safe. 

Scar excision with a small ellipse is reasonable. There will be another scar and this will require postoperative scar management.