Yes, we can.
If you are importing data into Salesforce Sales Cloud, please use this link - https://www.import2.com/salesforce/new?mode=advanced,
If you are importing data into Salesforce Service Cloud, please use this link - https://www.import2.com/salesforceservicecloud/new?mode=advanced
On Step 3 make sure to check "Import to Sandbox" in the Salesforce box and try your free sample import.