When I added sand I found putting it in a ziplock bag in increments and then slowly put tank water in and sunk the bag. That contained the sand storm in the bag. Once I sunk it then I could dump it and the wet sand immediately settled vs getting stirred up.
I would add sand slowly. Do only portions at a time to allow what you put in to get activated by the existing sand.
Lots of people do it. Some even change the entire substrate too.