Yes, but just like with internal employees, you should review and monitor the quality of the work. Depending if it is a one off requirement or an ongoing requirement would determine my approach.
If one-off, then take a look at:
oDesk.com or Freelancer.com
If it is ongoing work then, I would look for a company like offsitestaff.com.au where they have an office in the Philippines, supervision and the staff would be working for you.