There is no method to run the code directly in the VBA.
However, if you have already defined the SAS Program, executed it in the SAS Add-in and you have results in the workbook, you could save the workbook, and use the Refresh method to refresh the workbook or a sheet in the workbook that contains the location of the code results.
However, the first suggestion of placing your code in a stored process and executing the store process from the VBA would be a good solution to this question.