Yes, you can easily buy a SIM card in the United States without a long-term contract or a social security number. They are widely available for purchase both online and at various physical retail locations. Where to Buy a SIM Card
T-Mobile® SIM Card: Prices, 1 Colors, Sizes, Features & Specs can i buy a sim card
You can find physical SIM cards at several types of establishments: Yes, you can easily buy a SIM card