You can add another Sim to your World in The Sims 4 by creating a new Sim in Create-A-Sim (CAS) and moving them into an empty lot.
Here's how to do it:
1. Create a New Sim
- Open The Sims 4 and go to the Create-A-Sim mode.
- Design your new Sim's appearance, personality, and traits.
- Once you're happy with your creation, save your Sim.
2. Find an Empty Lot
- Go to the World Map and find an empty lot.
- You can either build a new home on the lot or place a pre-built house.
3. Move Your Sim into the Lot
- Select the "Move Sim In" option from the lot's menu.
- Choose your newly created Sim from the list.
- Your Sim will now be moved into the lot.
4. Start Playing
- You can now start playing with your new Sim and explore the world.
Adding a new Sim can add depth and variety to your game. You can create families, friends, and even rivals to interact with your existing Sims.