Some organisations will have a policy of sponsoring their own employees who wish to undertake postgraduate courses or they may agree to fund individual employees as part of their career development programme.
Ask your HR department or line manager about the possibility of sponsorship. Put together a strong case to convince them of the benefits of your postgraduate qualification. It may be useful to draft a business case document or presentation. If your employer agrees to sponsor your studies, you should be prepared to sign a contract agreeing to work for the company for a fixed period of time following the completion of your course.
Working full-time and studying part-time is hard work and you will need the support and understanding of your employer. You will need to negotiate time to attend classes and show that you are equally committed to your professional and academic work.