SmartDraw drawings and diagrams (.sdr) can be exported to all kinds of graphics formats, including EMF format (Enhanced Windows metafile), which is what sdr to emf conversion actually represents.
This can be done using the program's main File ► Save function that will create a .emf file from the .sdr file. As far as we know, no other program supports SmartDraw drawings, so you cannot perform this conversion without it.