That's really not necessary. Police, ambulance and medical staff will use
universal precautions when handling any dead body, and in the current times of Coronavirus, these measures would most likely be enhanced to further protect against the specific viral threat. Basically, any dead body will be treated as if it potentially had Coronavirus until confirmed otherwise.
Are you saying that you have been tested positive for Coronavirus? Or are you worried just-in-case?
If you had Coronavirus, I suppose there is a miniscule risk of an unprotected civilian finding your body and becoming contaminated, but as another user responded, transmission from a corpse is very unlikely. I suppose if you wanted to be absolutely sure (probably to the point of paranoia), you could place a sign on or near your body warning (truthfully or not) that you had Coronavirus and not to touch or approach your body. But this might then require the diversion of resources to handle and test your body that might perhaps have been used elsewhere on real, confirmed Coronavirus patients or corpses.
You may also have the option of voluntarily being tested for Coronavirus while you are still alive, and a (hopefully) negative result may put your mind at rest about the very unlikely possibility of your body transferring it after death.