CorelDraw can create its templates (.cdt) from many picture and graphics sources, including PNG (portable network graphic) files. It appears this is the only way how to make this conversion happen, as CorelDraw formats are generally closed and not supported in 3rd party programs.
Convert Portable Network Graphic to CorelDRAW template file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert png to cdt on Windows
A set of applications used by professional graphic designers
Convert from png file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.