How to disable collisions on players

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You would need to use Collision Groups and Physics Service
Variables:

local PhysicsService = game:GetService("PhysicsService")
local PlayerService = game:GetService("Players")

Either create a collision group prior to using this script or do this:

PhysicsService:CreateCollisionGroup("PlayerCharacters")

Set the Player collision group to be not collide-able with other players (this can be done manually as well):

CollisionGroupSetCollidable("PlayerCharacters", "PlayerCharacters", false)

If you would do the set-up manually then it should look something like this:
image

Then on player and character added do the following:

local function characterAdded(character)

end

local function playerAdded(player)
   player.CharacterAdded:Connect(characterAdded)
end

PlayerService.PlayerAdded:Connect(playerAdded)

Now run through the bodyparts of the character like so:

for _, bodyPart in pairs(character:GetChildren()) do
   if bodyPart:IsA("BasePart") then
      PhysicsService:SetPartCollisionGroup(bodyPart, "PlayerCharacters")
   end
end

Though sometimes the script might have some delay so we want to go through the already joined players:

for _, player in pairs(PlayerService:GetPlayers()) do
   playerAdded(player)
end

Same for the characters of the players

if player.Character then
   characterAdded(player.Character)
end

The full script would look something like this:

-- Variables
local PhysicsService = game:GetService("PhysicsService")
local PlayerService = game:GetService("Players")

-- Collision group set-up
PhysicsService:CreateCollisionGroup("PlayerCharacters")
CollisionGroupSetCollidable("PlayerCharacters", "PlayerCharacters", false)

-- Functions & connections
local function characterAdded(character)
   for _, bodyPart in pairs(character:GetChildren()) do
      if bodyPart:IsA("BasePart") then
         PhysicsService:SetPartCollisionGroup(bodyPart, "PlayerCharacters")
      end
   end
end

local function playerAdded(player)
   player.CharacterAdded:Connect(characterAdded)

   if player.Character then
      characterAdded(player.Character)
   end
end

for _, player in pairs(PlayerService:GetPlayers()) do
   playerAdded(player)
end

PlayerService.PlayerAdded:Connect(playerAdded)
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