Can I change my implants from subglandular to submuscular? (Photo)

Yes changing the pocket from sunglandular to submuscular is a good option to treat capsular contracture 

 I am sorry to hear about the complication you have experienced.
In the event of capsular contracture or severe breast implant rippling replacing breast implants in the sub muscle position is the best way to go in my opinion.  
  Generally, the procedure ( conversion from some glandular to sub muscular positioning)  involves removal of the current breast implants, careful dissection of the sub muscular (dual plane) space, and usually closing off the previously dissected space above the pectoralis major muscle. Closing off the existing breast implant pocket will help prevent the new implants from slipping from the sub muscular (dual plane) pocket into the previous pockets.
Depending on the patient's anatomy and goals, sometimes additional work may be necessary to improve the outcome of the procedure. For example, additional manipulation the breast implant pockets (such as capsulorrhaphy) or of the overlying skin envelope (such as breast lifting) may be necessary. If the pocket conversion is being done because of breast implant rippling, the use of acellular dermal matrix may be helpful. 
 
I hope this helps.