1. Edit default.ide file inside DATA folder, add this line at line 50:
8, sandman, sandman, CIVMALE, STAT_CRIMINAL, man, 0, null, 9,9
(If you have a mod that uses this ID you'll have to change it to something else, you'll also have to edit it on the CLEO file)

2. Add files sandman.dff y sandman.txd to gta3.img (Use IMGTool: https://www.gtagarage.com/mods/show.php?id=63)

3. Download and install CLEO https://cleo.li/cleo4/VC.CLEOv2.0.0.5.zip

4. Add file sandmen.cs to the CLEO folder

And now just go look for the sandmen. If you need help, refer to the manual. And visit my website at daesblog.ml