You can request money from someone with your SunCash account. The person you choose doesn't have to be a SunCash customer. All you need to provide is their mobile number or e-mail address, amount requested and a message. The person you are requesting money from will receive an e-mail with clear indication of how to respond to your request.
No, in the withdraw money section the only option is to withdraw money is to provide a bank account details under the same name of the SunCash account holder. But, you can send money to anyone you want under the 'Send Money' section.