Gaming laptop for Sims 4 with all packs

b059f46c3de0e53c​  There are plenty of laptops under $1,000 U.S. that can run Sims 4 on ultra graphics settings with some room to spare.  The graphics card is going to be the limiting factor, and most mods have no effect on graphics, instead taxing the processor (if they increase the demands of the game at all).  Custom content may increase the demands of the game, depending on how it's made, but you should still be fine on that front with an RTX 4050.

If you want more CPU power for other reasons, the Intel Ultra 5 225H (what a name.....) and Ryzen 7 8845HS are about as fast as you're going to see in reasonably-priced laptops, with the higher SKUs only showing up with faster GPUs, at least as far as I've seen and am seeing now.  This is the only laptop I found with Intel CPU for under $1,000, in configurations with an RTX 4050 and 5050:

https://www.hp.com/us-en/shop/pdp/omen-16-inch-gaming-laptop-pc-a58a5av-1
https://www.hp.com/us-en/shop/pdp/omen-16-inch-gaming-laptop-pc-a59p7av-1

The laptop won't ship for four weeks though since it's custom-built.  If you do go this route, it's worth considering an upgrade to the screen for the 400-nit brightness ($70), although if you play in a darkened room, you may not care at all.  If you want more RAM, buy and add it yourself for $80 or whatever price you can find rather than paying $260.

If you'd like the laptop sooner, or don't want the Omen for one reason or another, these have an 8845HS and the (barely faster) 8945HS, respectively, and an RTX 4060, so you'd get a bump on both counts above most of what else is available for under $1,000.

https://www.newegg.com/p/2S3-0008-006C4
https://www.newegg.com/p/N82E16834156648

The MSI would run hotter and noisier, in case that's a consideration.

If none of these is what you want, let me know why, and I'll list some laptops that fit your needs better.  They'd have another small downgrade to the CPU, at least given what's available right now, but you'd still have plenty of power, just not quite as much as with the above.