Yes, you can use a band saw to cut an aluminum coil. Band saws are versatile and can cut a variety of materials, including aluminum. However, it's crucial to use the right blade designed for metal cutting. Ensure the blade is sharp and has the appropriate teeth pitch for aluminum to avoid damaging the material or the blade. Adjust the speed to a lower setting to prevent overheating and ensure a clean cut. Always follow safety precautions and wear protective gear when operating power tools.