SAP is providing a free 30 day access to the SAP HANA Sandbox via Cloudshare.
Once you are at the above mentioned link, read and accept the end user license Agreement. After that confirm your data by clicking on Submit on the next page. (You can leave Access Code as blank).
Once you have registered you will receive an email from SAP with the access details. Just follow the instructions in the email to access the SAP HANA sandbox.
Since this access is provided via Cloudshare, you can experience some issues while connecting to the server.
Issue: The system asks for a plugin to be installed.
Solution: You can install the plugin from the link provided there or you can select skip and you will be connected. You may experience issues to install the plugin and in such case its better to skip.
Basically you can connect to cloudshare servers using RDP or Console Access. The former is supposed to provide more faster experience. If you are able to install the plugin, you are connected using RDP.
If you still face any unresolvable issues, you can check your system compatability @ the following link https://use.cloudshare.com/test.mvc and just follow the instructions based on the test results.