I don't think it is possible because the variables order is registered in the metadata if you are opening a data set from SASApp and which is loaded by your ETL developers.
However you can use the Filter and Sort task node to re-arrange the variable order by sorting the variable names.
Ready to join fellow brilliant minds for the SAS Hackathon?
Build your skills. Make connections. Enjoy creative freedom. Maybe change the world. Registration is now open through August 30th. Visit the SAS Hackathon homepage.