In order to get in to the field of architecture you will have to pursue your B.Arch or a diploma in architecture.
But if you are looking at construction of major dams,railways,etc then civil engineering is something that you can consider. It will add more of an engineering perspective to your knowledge of designing.
There's no course in architectural engineer, it will be a designation that you will be able to attain one you in to the industry.
For more information on civil engineering and architecture (career map,career scope,remuneration,benefits etc) log on
Hope this helps.