program to design my grow room?

I would like to design my grow room and I need a program to do so.

Any recommendation?

Why would you need a program to do So? I'm sure plenty of people could help you out. It's not all that tough to design when you have what available space you can use. How much power can you run. How many plants in the area. What kind of lights would you like to run.

I meant a program to draw a sketch of my build like you would do it with a pen and paper but on the computer.

Wjy not just do it with pencil, graph paper and a ruler. Much easier...

Just use sketchup, lots of components you want are already in the searchable database.
Do a tutorial or 2 on youtube, it's really easy compared to say, DANCAD on DOS.

i used sketcup, heres my build https://www.rollitup.org/t/full-build-of-building-and-grow-by-newb.954316/, i didnt setup my buckets etc in there which i should have, would have helped with space management etc, but ended up winging it and getting it right. but yes sketchup is pretty awesome, takes a day to learn it, maybe..

Cool thanks guys.