Hey Surat,

First let me give you a short description about both of them:

Architecture engineering:It teaches you art of  designing  houses,malls,office spaces etc.If you  pursue an UG course in architecture,you will get B.Arch Degree!

Interior Designs:Here you will learn to enhance the interior of a building.

Now coming to your question,See you can be an Interior designer without holding a degree in architecture engineering but most interior design firms require Interiors to hold at least a bachelor's degree.A degree in architecture is always preferred.

You can find programs in  interior designs at many design institutes  but you should go for pursuing B.Arch from any good college.

Good luck!