Looks like you want to implement a regular file upload.
There's actually plenty of options, e.g. using Data Services.
With SPS9 there's now information lifecycle management available to model data flows directly within SAP HANA. You may want to check this.
For the IMPORT statement: this is not a feature designed to facilitate recurring data flows or even provide data integration. It's a rather low level bulk data loading tool aiming at getting (already well formed) mass data into SAP HANA quickly.
Due to the lack of comprehensive handling of "bad" data, I wouldn't recommend it for any (half-)automated data load.
- Lars