This conversion seems to be mainly representing an export of maps or other images saved in LizardTech MrSID format (.sid) to some other raster format, for example JPEG 2000 (.jp2, .jk2). It can be done with some dedicated conversion utility, but be prepared that the resulting files may be very large.
Convert LizardTech MrSID image file format to JPEG 2000 (ISO 15444-1) picture.
We have found 2 software records in our database eligible for .sid to .jp2 file format conversion.
Microsoft Windows software - convert sid to jp2 on Windows
An image arching and compression tool
Convert from sid file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned sid to jp2. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A dedicated converter for SID format